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…

If the n<sup>th</sup> term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is

For an A.P. if a<sub>25</sub> - a<sub>20</sub> = 45, then d equals to:

If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is

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

If 18<sup>th</sup> and 11<sup>th</sup> term of an A.P. are in the ratio 3 : 2, then its 21<su…

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 the sum of n terms of an A.P. is 3n<sup>2</sup> + 5n then which of its terms is 164 ?