ISEE Upper Level Quantitative : ISEE Upper Level (grades 9-12) Quantitative Reasoning

Study concepts, example questions & explanations for ISEE Upper Level Quantitative

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Example Questions

Example Question #22 : Sets

Seven freshmen and seven sophomores are running for student council. Each freshman will choose three of the candidates from his or her class; each sophomore will choose four from his or her class.

Which is the greater quantity? 

(a) The number of ways a freshman can fill out his or her ballot

(b) The number of ways a sophomore can fill out his or her ballot

Possible Answers:

(b) is greater.

It is impossible to tell from the information given.

(a) is greater.

(a) and (b) are equal.

Correct answer:

(a) and (b) are equal.

Explanation:

In both cases, candidates are selected without regard to order, making them combinations (as opposed to permutations). 

(a) The freshmen are choosing three elements from a group of seven, or :

(b) The sophomores are choosing four elements from a group of seven, or :

These quantities are equal.

Example Question #177 : Data Analysis

An arithmetic sequence begins as follows:

The Fibonacci sequence begins 

,

with each subsequent term being the sum of the previous two.

Which is the greater quantity?

(a) The tenth term of the arithmetic sequence

(b) The tenth term of the Fibonacci sequence

Possible Answers:

It is impossible to tell from the information given.

(a) and (b) are equal.

(a) is greater.

(b) is greater.

Correct answer:

(a) and (b) are equal.

Explanation:

(a) The arithmetic sequence has common difference ; its tenth term is .

(b) By beginning with  and taking the sum of the previous two terms to get each successive term, we can generate the Fibonacci sequence:

Therefore the two are equal.

Example Question #23 : Sets

Twelve candidates are running for four vacancies on the school board. Six of the candidates are Democrats, and six are Republicans. Samantha wants to vote for two Democrats and two Republicans.

Which is the greater quantity? 

(a) The number of ways Samantha can cast her ballot so that she votes for two Democrats and two Republicans

(b) 

Possible Answers:

It is impossible to tell from the information given.

(b) is greater.

(a) is greater.

(a) and (b) are equal.

Correct answer:

(b) is greater.

Explanation:

The number of ways Samantha can choose two Democrats out of the six is the number of combinations of 2 chosen from a set of 6:

This is also the number of ways Samantha can choose two Republicans out of the six.

These are two independent events, so we multiply them to get the number of total ways Samantha can vote with these specifications:

Therefore (b) is greater.

Example Question #24 : Sets

The Fibonacci sequence begins 

,

with each subsequent term being the sum of the previous two.

Which is the greater quantity?

(a) The sum of the seventh, eighth, ninth, and tenth terms of the Fibonacci sequence

(b) The twelfth term of the Fibonacci sequence

Possible Answers:

It is impossible to tell from the information given.

(a) and (b) are equal.

(a) is greater.

(b) is greater.

Correct answer:

(b) is greater.

Explanation:

By beginning with  and taking the sum of the previous two terms to get each successive term, we can generate the Fibonacci sequence:

The seventh through tenth terms, added together, yield a sum of

,

which is less than the twelfth term, .

Example Question #25 : Sets

The Student Council comprises thirty students, from which four are chosen to fill the offices of President, Vice-President, Secretary, and Treasurer. Which is the greater quantity?

(a) The number of ways the four offices can be filled

(b) 

Possible Answers:

(a) and (b) are equal.

(b) is greater.

(a) is greater.

It is impossible to tell from the information given.

Correct answer:

(b) is greater.

Explanation:

(a) There are 30 ways to fill the office of President. Afterward, there will be 29 ways to fill the office of Vice-President, 28 ways to fill the office of Secretary, and 27 ways to fill the office of Treasurer. Multiply:

(b) 

This makes (b) greater.

Example Question #181 : Data Analysis

The first six terms of a sequence are:

Which is the greater quantity?

(a) The tenth term of the sequence

(b) 

Possible Answers:

(b) is greater.

(a) is greater.

(a) and (b) are equal.

It is impossible to tell from the information given.

Correct answer:

(b) is greater.

Explanation:

The terms are generated by alternately subtracting two and adding two. The next four terms are:

Therefore (b) is greater.

Example Question #666 : Isee Upper Level (Grades 9 12) Quantitative Reasoning

A bag has  blue,  green,  red, and  purple balls.

Quantity A: The probability of choosing  red ball and  blue ball after two consecutive picks, with replacement.

 

Quantity B: The probability of choosing  blue or  red ball on one pick.

Possible Answers:

Quantity A is greater.

The two quantities are equal.

Quantity B is greater. 

The relationship cannot be determined from the information given.

Correct answer:

Quantity B is greater. 

Explanation:

Quantity A: There are a total of  balls, so the probabilty of choosing  red ball AND  blue ball is

 , which gives us .

Quantity B: The probability of choosing  blue ball OR  red ball is .

Quantity B is larger. 

Example Question #182 : Data Analysis

If Joe flips a coin twice, what is the probability that at least one tail will occur?

Possible Answers:

Correct answer:

Explanation:

There are four possible outcomes (with H being heads and T being tails): HH, HT, TT, TH. There are three outcomes that contain a tail: TH, HT, and TT. Therefore the probaility that at least one flip will show tails is .

Example Question #31 : How To Find The Missing Part Of A List

An arithmetic sequence begins

What number replaces the square?

Possible Answers:

Correct answer:

Explanation:

Since this is an arithmetic sequence, each entry in the sequence is obtained by adding the same number to the previous entry - this number is

Let  be the number in the square. Then 

Example Question #31 : Sets

The first two terms of an arithmetic sequence are 

Which of the following expressions is equivalent to the fifth term?

Possible Answers:

Correct answer:

Explanation:

An arithmetic sequence is formed by adding the same expression to each term to get the next term; this common difference is 

.

To obtain the fifth term, add  to the second term three times - equivalently, add three times this to the second term;

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