Question

show that one and only one out of N, N + 4, n+ 8, n+ 12 and n + 16 is divisible by 5 Where n is any positive integer​

Answer 1

put the value of n=1

1,1+4 , 1+8 , 1+12 , 1+16

1, 5, 9 , 13 , 17

thus only n+4 =5 is the only no. divisble by 5

Answer 2

put n equals to 1 and get value and check which is divisible