Which term of the AP: 121, 117,113, ….., is its first negative term?

Which term of the AP: 121, 117, 113,……… is the first negative term? [Hint:Find n for a_(n) lt 0 ]

Which term of the AP: 21,18,15,…….. Is -81 ?

Which of the term of the AP 53, 48, 43... is the first negative term?

Which term of the AP 3,10, 17,... will be 84 more than its 13th term?

Which term of the sequence 20 ,19 1/4, 18 1/2, 17 3/4,dot is the first negative term?

If the sum of first 2n terms of the A.P. 2, 5, 8,…. Is equal to the sum of the first n terms of the A.P. 57, 59, 61,… then find n.

If the sum of the first 2n terms of the AP 2,5,8.....is equal to the sum of the first n terms of the AP 57,59,61, ....then n equals

The nth term of an A.P. is p, show that, the sum of its first (2n-1) terms is (2n-1)p.

The twelfth term of an A.P. is (-13) and the sum of its first four terms is 24, find the sum of first 10 terms of the A.P.

The nth term of an A.P. is p and the sum of its first n terms is q. Prove that its first term is (1)/(n)(2q-p n) .