Calculate the sum: `5+(-5)+5+(-5)+` if the number of terms is 10. if the number of terms is 11.

Simplify: 5+(-5)+5+(-5)+ When the number of terms is 20 when the number of terms is 25.

Simplify: 5+(-5)+5+(-5)+ When the number of terms is 20 when the number of terms is 25.

First term of an A,P is -5 and its last term is 45 If the sum of these terms is 120 find the number of terms.

The first term of an A.P. is 5 and the last term is 45. If the sum of all the terms in 400. the number of terms is

The first term of an AP is - 5 and the last term is 45 . If the sum of the terms of the AP is 120 , then find the number of terms and the common difference.

The first term of an AP is -5 and the last term is 45. If the sum of the terms of the AP is 120, then find the number of terms and the common difference.

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36 then the number of terms will be a. 5 b. 8 c. 6 d. 7

If sum of n terms of AP 2, 5, 8, .... is 155 then the number of terms is

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be (a) 5 (b) 6 (c) 7 (d) 8

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be (a) 5 (b) 6 (c) 7 (d) 8