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

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

The sum of first 20 odd natural numbers is

If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are

The 9<sup>th</sup> term of an A.P. is 449 and 449<sup>th</sup> term is 9. The term which is equa…

Find the first term of an AP whose 8<sup>th</sup> and 12<sup>th</sup> terms are respectively 39 …

What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?

If S<sub>n</sub> denote the sum of the first n terms of an A.P. If S<sub>2n</sub> = 3S<sub&gt…