" Q3.If the common difference of an A.P.is "3" ,then find a a "-" as "

If the common difference of an A.P.is 3, then a_(20)-a_(15) is

Find the common difference of A.P. 3, 1, - 1,- 3,…….

Find the common difference of the A.P. -5, -1, 3, 7 ……… .

Find the common difference of the A.P. : 3, 1, -1, -3, .......

Find the common difference of the A.P . — 5, — 3, — 1, 1, 3,………….

The first term of an A.P.is -7 and the common difference 5. Find its 18th term and the general term.

The first term of an AP.Is,the common difference is 3 and the last term is 80; find the number of terms.

Given sum of the first nterms of an A.P. is 2n+3n^(2) .Another A.P. is formed with the same first term and double of the common difference,the sum of n terms of the new A.P.is:

If the sum of n terms of an A.P.is 2n^(2)+3n then write its nth term.