[hline,,,],[hline" 20.",[" Find the common difference of the A.P whose first term is "12" and fifth "],[" term is "0.],1],[hline]

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

Find the sum of first 20 terms of an A.P. whose first term is 3 and the last term is 57.

Find the nth term of AP whose first term is 12 and common difference is 7.

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

Find the second and third terms of an A.P. whose first term is -2 and yhe common difference is -2.

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

Find first four terms of an A.P. , whose first term is -6 and common difference is +6 .

Find the common difference of an A.P. whose first term is 5 and the sum of its first four terms is half the sum of the next four terms.

Find the common difference of an A.P. whose first term is 5 and the sum of its first four terms is half the sum of the next four terms.

Find the common difference of an A.P. whose first term is 5 and the sum of its first four terms is half the sum of the next four terms.