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

The common difference of the A.P. $$\frac{1}{{2b}},$$ $$\frac{{1 - 6b}}{{2b}},$$  $$\frac{{1 - 12b}}{{2b}},$$ &…

The n<sup>th</sup> term of an A.P., the sum of whose n terms is S<sub>n</sub>, is

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

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

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

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

For A.P. T<sub>18</sub> - T<sub>8</sub> = ........ ?