A boy agrees to work at the rate of one rupee on the first day, two rupees on the second day, and four rupees on third d…

After striking the floor, a rubber ball rebounds to 4/5<sup>th</sup> of the height from which it has fallen.…

If the sum of it terms of an A.P. is 2n<sup>2</sup> + 5n, then its nth term is

The 3<sup>rd</sup> and 9<sup>th</sup> term of an arithmetic progression are -8 and 10 respective…

The 7<sup>th</sup> and 12<sup>th</sup> term of an arithmetic progression are -15 and 5 respectiv…

Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The di…

The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is

(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......