If $S_1,S_2,S_{3}S\_1\; ,\; S\_2\; ,\; S\_3$ are the sums of first n natural numbers, their squares and their cubes respectively, then $S_3(1+8S_1)S\_3(1+8S\_1)$ =

If a, b, c are in G.P., then

The series (n – 1), (n – 2), (n – 3), ……………… is a type of

If $n^{th}n^\{th\}$ term of a series is $3^{n}3^n$ , then the sum of n terms =

$n^{th}n^\{th\}$ term of -3 + 6 – 12 + 24 – 48 + …………… is

If a, b, c are in geometric progression then $\frac{a}{b}\backslash frac\{a\}\{b\}$ =

$\frac{x}{2}+\frac{x}{4}+\frac{x}{8}+\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{\infty }=\backslash frac\{x\}\{2\}\; +\backslash frac\{x\}\{4\}\; +\; \backslash frac\{x\}\{8\}\; +\; ........\; \backslash infty\; =$

The nth term of an A.P. is given by an = 3 + 4n. The common difference is

If the sum of three numbers in an A.P. is 9 and their product is 24, then numbers are

The $n^{th}n^\{th\}$ term of an A.P. 5, 2, -1, -4, -7 … is