GRE Exam Numerical Ability Number System

The sum of four consecutive odd numbers is equal to the sum of 3 consecutive even numbers. Given that the middle term of the even numbers is greater than 101 and lesser than 200, how many such sequences can be formed?
(A)12 (B) 17 (C)25 (D)33

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GRE Other Question

What is the probability that a 3-digit positive integer picked at random will have one or more 7 in its digits?

A. 271/900 B. 27/100 C. 7/25 D. 1/9 E. 1/10 If x is a positive integer with fewer than 3 digits, what is the probability that x*(x + 1) is a multiple of either 4 or 5?
[A] 4/99 [B] 2/25 [C] 8/99 [D] 86/99