Question

Find the number of 4 digited numbers that can be formed using the digits 1, 2, 5, 6, 7. How many
of them are divisible by (i) 2 (ii) 3 (iii) 4 (iv) 5 (v) 25​

Answer 1

Step-by-step explanation:

number of four different digits is formed with the help of the digits 1,2,3,4,5,6,7 in all possible ways. Let

(i) k be the number of such numbers can be formed.

(ii) m be number of such numbers which are even .

(iii) n be number of such numbers which are exactly divisible by 4.

(iv) p be number of such numbers which are are exactly divisible by 25.

Find

p

k+m−n