In a G.P. the first term is` a,` second term is `b` and the last term is `c` then sum of the series is

If first term of an A.P is a , second term is b and last term is c , then show that sum of all the terms is ((a+c)(b+c-2a))/(2(b-a)) .

Show that the sum of an A.P. whose first term is a, the second term is b and the last term is c, is equal to ((a+c)(b+c−2a))/(2(b−a))

The first term of an A.P. is a, the second term is b and last term is c. Show that the sum of A.P. is : ((b+c-2a)(c+a))/(2(b-a)) .

Show that the sum of an A.P.whose first term is a,the second term is b and the last term is c,is equal to '((a+c)(b+c-2a))/(2(b-a))

Show that the sum of an AP whose first term is a, the second term is b and the last term is c is equal to ((a+c)(b+c-2a))/(2(b-a)) .

If the first term in an arithmetic series is 3 and the last term is 136, and the sum is 1390, what are the first four terms ?

In an increasing G.P. the sum of the first and last term is 66 the product of the second and the last terms is 128 and the sum of the terms is 126 . Then number of terms in the series is .

If the first term of an infinite G.P. is 1 and each term is twice the sum of the succeeding terms, then the sum of the series is

In a G.P. the product of the first four terms is 4 and the second term is the reciprocal of the fourth term. The sum of infinite terms of the G.P is