GRE Exam Numerical Ability Probability

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

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GRE Other Question

A family consisting of one mother, one father, two daughters and a son is taking a road trip in a sedan. The sedan has two front seats and three back seats. If one of the parents must drive and the two daughters refuse to sit next to each other, how many possible seating arrangements are there? 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