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Q.

The number of four digited numbers formed by 1, 2, 5, 6, 7 divisible by 25 is

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a

42

b

12

c

26

d

46

answer is B.

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Detailed Solution

Given digits are 1, 2, 5, 6, 7

A number is divisible by 25 when last 2 digits of the number is divisible by 25.

Question Image

Last 2 boxes can be filled by 25, 75 in 2 ways

Remaining 2 boxes can be filled by remaining 3 digits in 3P2  ways.

 Required 4 digit numbers =3P2×2

       =12

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