First slide

Permutations

Question

How many numbers can be made with the digits 3 , 4, 5, 6, 7 ,8 lying between 3000 and 4000, which are divisible by 5 while repetition of any digit is not allowed in any number?

Moderate

A

60
B

12
C

120
D

24

Solution

3 must be at thousand's place and since the number should be divisible by 5, 5 must be at unit's place. Now, we have to fill two places (tens and hundreds), i.e., ⁴P₂ = 12.

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App