GMAT Quantitative Reasoning Practice Test 1

Question : 25 of 100

Marks: +1, -0

X

is a prime number bigger than 10 . Also,

Y=X+X^3+X^5+X^7

. What is definitely true about

Y

Solution:

Because

X

is a prime number bigger than 10, it must be odd. Ignoring the powers of

X

in the expression of

Y

, you'll see that

Y

is a sum of 4 odd numbers therefore it must be even.

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