how many 3 - digit integers exist such that all their digits are odd ?
Select the correct option.
A) 80
B) 100
C) 120
D) 125
E) 135

Rationale: so last digit can be filled in 5 ways - 1 , 3,5 , 7,9 there are 5 possibilities . the answer is 5 ∗ 5 ∗ 5 = 125 the correct answer is d
Answer: D