[" nd the number of terms of the AP - "-12,-9,-6,-6,21" If "1" is add "],[" is A.P.then find the sum of all terms of the A.P.thus obtained "]

Find the number of terms of the A.P. -12 ,\ -9,\ -6,\ dot,\ 12 . If 1 is added to each term of this A.P., then find the sum of all terms of the A.P. thus obtained.

Find the number of terms of the A.P. -12 ,\ -9,\ -6,\ dot,\ 12 . If 1 is added to each term of this A.P., then find the sum of all terms of the A.P. thus obtained.

Find the number of terms in the A.P 3,6,9,12,….,111

Add number of terms of the "A*P*-12-9,-6,.....If 1 is added to each terms of this AP, find the sum of the new AP.

Find the 23rd term of the A.P, 9,4,-1,-6,…

Find the sum of first 10 terms of the A.P. 4+6+8+………

The number of terms in the A.P. 3, 6, 9,12, ….111 is _____.

Prove that the number of terms in the A.P. 3,6,9,….111 is 37

Find the sum of the first 10 terms of the A.P. 6,4,2,…..

Find the 15th term of the A.P. 21, 16,11,6……….