[" 4.If the sum of "3" th "k" trems of an difis "],[3k^(2)-k" and its common difference "],[" is "6" .What is its steem? "]

If the sum of first k terms of an A.P.is 3k^(2)-k and its common difference is 6. What is the first term?

If the sum of first k terms of an A.P. is 3k^2-k and its common difference is 6. What is the first term ?

The sum of n terms of an AP is 3n^(2)+ nand its common difference is 6, then find its first term.

The sum of n terms of an AP is 3n^2+n and its common difference is 6,then find its first term.

If the sum of n terms of an A.P. be 3n^2-n and its common difference is 6, then its first term is

The 5th term of an AP is -3 and its common difference is -4. The sum of its first 10 terms is

S_(n) denots the sum of first n terms of an A.P. Its first term is a and common difference is d. If d= S_(n)-k S_(n-1) + S_(n-2) then k= ……….

[" If the first term of an A.P is an integer with common difference "2" ,then the number of possible values of k for which the sum of first k terms is "153" is "(k>1)]

Let S_k,k=1, 2, …. 100 denote the sum of the infinite geometric series whose first term is (k-1)/(K!) and the common ratio is 1/k then the value of (100)^2/(100!)+underset(k=1)overset(100)Sigma|(k^2-3k+1)S_k| is ____________

If the sum of first 24 terms of a sequence whose n^(th) term is given by t_(n) = 3+(2n)/3 is k , then what is the value of k ?