What is the sum of the first 11 terms of an arithmetic progression if the 3<sup>rd</sup> term is -1 and the …

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…

How many terms are there in the GP 5, 20, 80, 320........... 20480?

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…

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

What is the sum of the first 12 terms of an arithmetic progression if the 3<sup>rd</sup> term is -13 and the…

How many 2-digit positive integers are divisible by 4 or 9?

Which term of the A.P. 92, 88, 84, 80, ...... is 0?