Question

If n = (2 x 10squared) + 3, then find the sum of the digits of n squared

Answer 1

Answer:

As the last digit of n^2 is 4 , then last digit of n is either 2 or 8 .

If we consider the last digit as 2 , then the digit before 4 can't be a odd number (as 5). It must be a even number ( it is a sum of the two same numbers, you can check this by taking any three digit ending with 2)

If we consider that last digit is 8 , then also the digit before 4 is a even number , as it is sun the of two same numbers + 6 .

So there is no value for n .