Question

Check whether 30n end with zero

Answer 1

30= 3•2•5
The prime factorisation of 30 contains 2 and 3. Therefore 30n can end with the digit 0.

Answer 2

if 30n can end with the digit zero so it is divisible by five for any natural no. n so 30n cannot ent with the digit zero so it is not divisible by 5 for any natural no. n