GRE Subject Test: Math : Combinational Analysis

研究概念,例子问题&解释for GRE Subject Test: Math

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Example Questions

Example Question #11 :Factorials

Evaluate:

Possible Answers:

Correct answer:

Explanation:

Step 1: Writein multiplication form:



Step 2: Multiply Out

Example Question #12 :Factorials

Evaluate:

Possible Answers:

Correct answer:

Explanation:

Step 1: Expand the numerator and denominator:



Step 2: Cross all numbers out that are common to both the numerator and denominator:

We are left with.

The value of

Example Question #13 :Factorials

What is?

Possible Answers:

Correct answer:

Explanation:

Step 1: Recall definition of factorial...

Factorial is a mathematical expression where you multiplyby every number below it until I hit. To find each number, subtractfrom the previous number

Step 2: Write out



Example Question #14 :Factorials

Evaluate:

Possible Answers:

Correct answer:

Explanation:

Step 1: Evaluate
Factorial-Multiply the number in front of the exclamation point by every number below until I hit

Example Question #15 :Factorials

Evaluate:

Possible Answers:

Correct answer:

Explanation:

Step 1: Evaluate each factorial expression separately...





Step 2: Take the evaluation of each expression and apply the operations in the problem:

So, we get

Example Question #16 :Factorials

Evaluate:

Possible Answers:

Correct answer:

Explanation:

Step 1: Apply the power rule (stacked) of exponents..

We get

第二步:评估the exponent...

We get

Step 3: Re-write the base:

Final answer:

Example Question #17 :Factorials

Evaluate:

Possible Answers:

Correct answer:

Explanation:

Step 1: Evaluate the parentheses first



Step 2: Multiply the outside by the final value in Step 1..

Example Question #18 :Factorials

Evaluate:

Possible Answers:

Correct answer:

Explanation:

Step 1: Define Factorial

Factorial is a mathematical expression which you multiply the number in front of the exclamation point by every number below it until you hit 1..

第二步:评估


Example Question #19 :Factorials

Evaluate:

Possible Answers:

None of the other answers

Correct answer:

Explanation:

Evaluate:

Evaluate:



Evaluate:

Example Question #20 :Factorials

Simplify the following expression:

Possible Answers:

Correct answer:

Explanation:

回想一下,!阶乘的数学方法。这意味着we multiply the number by all positive integers less than itself. In other words, this...

Becomes

This is a great job for a calculator, which yields:

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