How many 3-digit numerals begin with a digit that represents a prime number?	Choose the correct choice from the following answers.
A) 16
B) 80
C) 400
D) 180
E) 240

Rationale: prime digits 2 , 35 and 7 . three digit numbers _ _ _ 1 st place can be filled in 4 ways 2 nd place can be filled in 10 ways 3 rd place can be filled in 10 ways total = 4 * 10 * 10 = 400 ans : c
Answer: C