The `n^(t h)` term of the sequence `5+55+555+...` is
a.`5xx10^(n-1)` b. `5xx11^(n-1)` c. `5/9(10^n-1)` d. none of these

Find the sum of n terms of the sequence : 5 + 55 + 555 + ...........

In a sequence of (4n+1) terms, the first (2n+1) terms are n A.P. whose common difference is 2, and the last (2n+1) terms are in G.P. whose common ratio is 0.5 if the middle terms of the A.P. and LG.P. are equal ,then the middle terms of the sequence is (n .2 n+1)/(2^(2n)-1) b. (n .2 n+1)/(2^n-1) c. n .2^n d. none of these

Find the sum of n terms of the series : 5+55+555+…

Write down the first five terms of the sequence, whose nth term is (-1)^(n-1) , 5^(n+1)

If the coefficients of the (n+1)^(t h) term and the (n+3)^(t h) term in the expansion of (1+x)^(20) are equal , then the value of n is a. 10 b. 8 c. 9 d. none of these

Write the first five terms of the sequence whose n^(t h) terms are : a_n=(-1)^(n-1)5^(n+1)

Find the indicated terms of the sequence whose n^(t h) terms are : a_n=(-1)^(n-1)n^3;a_9

If n integers taken at random are multiplied together , then the probability that the last digit of the product is 1, 3, 7, or 9 is a. 2^n//5^n b. 4^n-2^n//5^n c. 4^n//5^n d. none of these

A sequence is defined as: t_(n+1)=t_(n)-t_(n-1) , where t_(n) denotes the n^(th) term of the sequence. If t_(1) =1 and t_(2)=5 , find the sum of the first 100 terms of the above sequence.

The sum of the series 1-3+5-7+9-11+ . . . . To n terms is