The least number that should be added to 2,397 so that the sum is exactly divisible by 3, 4, 5 and 6 ?

Directions: Find the wrong number in the following number series:

0.5, 2, 1, 4, 32, 512, 16384

Which of the following numbers is divisible by 25?

If two numbers are each divided by the same divisor, the remainders are respectively 3 and 4. If the sum of the two numbers be divided by the same divisor, the remainder is 2. The divisor is 

If the 5-digit number 535ab is divisible by 3, 7 and 11, then what is the value of (a² - b² + ab)?

On adding a natural number P to the product of four consecutive natural numbers we get a perfect square number. The minimum value of P is:

The largest natural number which exactly divides the product of any four consecutive natural numbers is

A number when divided by 5 leaves a remainder 3. What is the remainder when the square of the same number is divided by 5 ?