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 expression for the common difference of an A.P.whose first term is a and nth term is b .

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

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

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. the sum of whose first \ \ n terms is P/2n^2+Q n

Find the mean of first n terms of an A.P. whose first term is a and common difference is d.

Find the common difference of an A.P. whose first term is 100 and the sum of whose first six terms is five times the sum of the next six terms.

Find the second term and n t h term of an A.P. whose 6t h term is 12 and the 8t h term is 22.

Write an A.P. whose first term is 0..6 and the common difference 0.3.

Find the n^(th) term of an A.P. Whose first term is 200 and common difference is 7 .