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

If the fifth term of a GP is 81 and first term is 16, what will be the 4<sup>th</sup> term of the GP?

What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?

If the sum of first n even natural number is equal to k times the sum of first n odd natural numbers, then k =

If $$\frac{{5 + 9 + 13 + ...\,{\text{to}}\,n\,{\text{terms}}}}{{7 + 9 + 11 + ...\,{\text{to}}\,\left( {n + 1} \right)\,{…

If the sum of n terms of an A.P. be 3n<sup>2</sup> + n and its common difference is 6, then its first term i…

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

If the 3<sup>rd</sup> and the 5<sup>th</sup> term of an arithmetic progression are 13 and 21, wh…