What is the digit at the 100th place of number (225)⁴⁰ ?

The value of a 2-digit number is 5 times the sum of the digits. What is the product of the digits ?

What is the last digit of the sum S = 9²⁷ + 27⁹ ?

The greatest number of four digit which is divisible by 15, 25, 40 and 75 is :

Which of the following is a prime number?

The number π − 22/7 is