If the common difference of an A.P. is 3, then `a_20 - a_15` is

Write the expression for the common difference of an A.P. whose first term is a and n t h term is b .

Write the common difference of an A.P. whose n t h term is a_n=3n+7 .

Write the common difference of an A.P. the sum of whose first \ \ n terms is P/2n^2+Q n

The sum of the first ten terms of an A.P. , equals 155 and the sum of the first two terms of a G.P. equals 9. The first term of the A.P. is equal to the common ratio of the G.P. and the common difference of the A.P. is equal to the first term G.P.. Give that the common difference of the A.P. is less then unity, which of the following is correct ?

Find the common difference of the A.P whose first term is 12 and fifth term is 0.

Write the common difference of an A.P. whose nth term is x n+ydot

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