What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?

If 7<sup>th</sup> and 13<sup>th</sup> terms of an A.P. be 34 and 64 respectively, then its 18&lt…

If S<sub>1</sub> is the sum of an arithmetic progression of ‘n’ odd number of terms and S<sub…

If the sums of n terms of two arithmetic progressions are in the ration $$\frac{{3n + 5}}{{5n + 7}},$$   then t…

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?

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

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

The 3<sup>rd</sup> and 9<sup>th</sup> term of an arithmetic progression are -8 and 10 respective…