Which term of the G.P. $\frac{1}{3},\frac{1}{9},\frac{1}{27},\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\backslash frac\{1\}\{3\},\backslash frac\{1\}\{9\},\backslash frac\{1\}\{27\},........$ is  $\frac{1}{2187}\backslash frac\{1\}\{2187\}$

The $21^{st}21^\{st\}$ term of an A.P., whose first two terms are -3 and 4 is ………

The common difference of an A.P. for which $a_{18}-a_{14}a\_\{18\}\; -\; a\_\{14\}$ = 32 is ………

In an A.P., if a = 1, $a_n=20a\_n\; =\; 20$ and $S_n=399S\_n\; =\; 399$ then n = …………

Which term of G.P. $3,3\sqrt{3},9,\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}\mathrm{.}3,\; 3\; \backslash sqrt3,9,.......$ equals to 243?

If x, x + 2, x + 6 are three consecutive terms in G.P, find the value of ‘x’.

If $a_n=\frac{n(n+3)}{n+2}a\_n\; =\; \backslash frac\{n(n+3)\}\{n+2\}$ then find $a_{17}a\_\{17\}$ = ............

The sum of first 100 natural numbers is …………

If a, b, c are in G.P., then b = ………

Which term of the A.P -18, -16, -14, ………. is first positive term ?