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

The angles of a quadrilateral are in A.P. If the greatest angle is double of the smallest angle, find all the four angles.

Ten students of a class are lined up according to their heights. Height of first student is 150 cm, and every next student is 2 cm more in height. What is the total sum of heights of these ten students ?

Find the geometric progression whose 4th term is 54 and 7th term is 1458.