How many positive integers less than 500 can be formed using the numbers 1,2,3,and 5 for digits, each digit being used only once.
Options:
(A) 34
(B) 677
(C) 197
(D) 177
(E) 191 Now, let's think a bit. Some random thoughts:
Single digit numbers = 4
Double digit numbers = 4 x 3 = 12
Three digit numbers = 3 x 3 x 2 x 1 = 18
Total = 34
The final answer: (A).