Question

5n -1 is always divisible by what

Answer 1

Solution:-

5n-1

n = 1 , 2, 3..............n

if n =1 then ,
5×1-1 = 4
if n= 2 then ,

5 ×2-1 = 9
if n = 3 then,

5×3 - 1 = 14

similarly all 4 , 9, 14 is divisible by 1

your right answer is 1 ans