GRE Numeric Entry Sample Questions

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1. Question :

Find the value of (sinA+sinA^2) if cosA^2+cosA^4=1

[sinA^2=sinA*sinA]

Correct Answer:

1

Explanation:

We know that sinA^2+cosA^2=1

cosA^2+cosA^4=1

1-cosA^2=cosA^4

sinA^2=cosA^4

Taking square root of both sides, we get

sinA=cosA^2

sinA=1-sinA^2

sinA+sinA^2=1

2. Question :

How many straight lines can be drawn by joining 12 points in a plane when no three points are collinear?

Correct Answer:

66

Explanation:

The number of straight lines is given by C(12,2)

C(12,2)=12!/[(12-2)!2!]

=12!/(10!2!)

=12*11/2

=6*11=66

3. Question :

How many three digit even numbers exist with distinct digits?

Correct Answer:

328

Explanation:

The numbers shall contain the digits 0,2,4,6 and 8 only in the units place.

Number of numbers that end in zero=9*8*1=72

Number of numbers that end in any one of 2, 4, 6 and 8=8*8*4=256

 

Total numbers=72+256=328

 

GRE Numeric Entry Sample Questions

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