The sum of four numbers in G.P. is 60 and the arithmetic mean of the first and the last is 18. Find the numbers.

Find the arithmetic mean of first 8 natural numbers.

Find the arithmetic mean of first ten even natural numbers.

The arithmetic mean of first n odd natural numbers is :

The sum of four numbers in A.P. is 4 and their product is 385. Find the numbers.

The sum of four numbers in an A.P. is 16 and sum of their squares is 84. Find the numbers.

The sum of an infinite number of terms of a G.P. is 15 and the sum of their squares is 45. Find the G.P.

The sum of n terms of an A.P. is 136, the common difference is 4 and the last term is 31, find the number of terms.

The sum of three numbers in A.P. is -3 and their product is 8. Find the numbers.

Find the mean of the first five whole numbers.