The first term and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then find the number of terms

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 7 . If the sum of its terms is 36 , then the number of terms will be

4.If the first and last terms of an A.P.are 1 and 11 respectively and the sum of its terms is 30. find the number of terms in the A.P.

The first and last terms of an A.P. are - 7 and 233 and the sum of the A.P. is 9153. Find the number of terms in the A.P.:

The first term of an A.P. is 3, the last term is 83 and the sum of all its terms is 903. Find the number of terms and the common difference of the A.P.

The sum of first 8 terms and first 24 terms of an A.P. are equal. Find the sum of its 32 terms.

If the sum of first 10 terms of an A.P is 60 and sum of first 15 terms is -165 then find the sum of its n terms

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.

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.