Question

20 The number of 4 digit numbers greater than 5,000 can be formed out of the digits 34,56
and 7(No. digit is repeated). The number of such is
​

Answer 1

Answer:

12

Explanation:

Let the number formed is of the form: abcd

The Number is formed out of: 3, 4, 5, 6

So,

The digit 'a' can be replaced with: 5, 6 I.e., in 2 numbers

The digit 'b' can be replaced with 3 numbers.

The digit 'c' can be replaced with 2 numbers

and, the last digit 'd' can be replaced with only one number.

Thus, Required answer = 2×3×2×1 = 12.