Question

if a number x ends with a prime no. then cube root of x cannot end with the digit
1. 6
2. 3
3. 7
4. 8

Answer 1

Hi...

Before answering your question... I want to tell you that this question was I think asked in "Aakash Anthe 2018"...Am I right.

Take any number which is a perfect cube and ends with prime number say 27 ..then the cube root of it is 3 then 3 is incorrect option ...take another number say 512 then cube root of it is 8 so it is also removed.

Now take 343 and cube root of it is 7 so seven is also removed....now at last when you do the cube of 6 it will be 216 which doesn't ends with prime number...hence any number x which ends with prime number then cube root of it can't end with 6..

Hope you like my answer...

Devesh

Answer 2

216 doesn't end with prime no. So how it can be the solution