Question

If a mobile has 5 digits password, then
how many different passwords can be

set, so that it must be divisible by 4?
[NIFT UG 2015
(a) 25000 (b) 105-102
(C) 5! - 4!
(d) 24000​

Answer 1

Hey Mate!!

1st digit can be any from 1 to 9.

2nd and 3rd digit can be any from 0 to 9.

4th and fifth digits must be one of 04, 08, 12, 16, 20, ... 96, 00. => 25 possibilities.

So, 9 × 10 × 10 × 25.

22,500 possibilities are there

Hope this helps you!!

Answer 2

Answer:

d. 24000 is the answer to your question