First term and common difference of an A.P. are 6 and 3 respectively : Find `S_27`

The first term and common difference of an A.P. are 3 and -2 respectively . Find its 6th term.

The first term and common difference of an A.P. are 3 and -2 respectively . Find its 6th term.

The first term and common difference of an A.P. are 3 and 2 respectively. Find the sum of first fifteen terms.

First term and common difference of an AP are 10 and -4 respectively find S_(n) and hence find S_(25) .

The first term and common difference of an A.P. are a and d respectively. If mth and nth terms of this A.P. are 1/m and 1/n respectively, then the value of (a-d) is-

The first term and the common difference of an A.P. are 12 and 4 respectively. If t_n =96 , find n .

The 1st term and the common difference of an A.P. are 10,000 and 2000 respectively . Find the sum of the first 12 terms.

The first term and common difference of an A.P. are respectively 4 and 2. If the sum up to n terms is 88, find n.

The first term and common difference of an A.P. are respectively -2 and -4. If the sum upto n terms is —288, find n.

The first term, common difference and last term of an A.P. are 12,6 and 252 respectively, Find the sum of all terms of this A.P.