Q23 of 202 Page 10

The nth term of an A.P., the sum of whose n terms is S_n, is

The sum of n terms of an A.P is given by S_n

S_n = (2a + (n–1) d)

If the sum of n terms is given that is S_n is given then the n^th term is given by the formula

T_n = S_n– S_n–1

Where S_n–1 is sum of the (n–1)^th term of the A.P.

The 9th term of an A.P. is 449 and 449th term is 9. The term which is equal to zero is

If are in A.P. Then, x =

The common difference of an A.P., the sum of whose n terms is S_n, is

If the sums of n terms of two arithmetic progressions are in the ratio , then their nth terms are in the ratio

The nth term of an A.P., the sum of whose n terms is Sn, is