Numbers Questions

If the 3rd and the 5th term of an arithmetic progression are 13 and 21, what is the 13th term?

What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?

Find the missing number?

If the square of sum of three positive consecutive natural numbers exceeds the sum of their squares by 292, then what is the largest of the three numbers?

Which of the following is equivalent to 0.565656...?

The 3rd and 6th term of an arithmetic progression are 13 and -5 respectively. What is the 11th term?

What is the least number that can be multiplied to 69120 to make it a perfect cube?

What least number must be added to 213, so that the sum is completely divisible by 9?