How many terms of the A.P. `-6,(-11)/2, -5`…… are needed to give the sum - 25?

How many terms of the A.P.- 6, (-11)/2,-5, (-9)/2 ... are needed to give the sum zero ?

How many terms of the A.P. 9, 6, 3, 0, -3, ... will be needed to give the sum -216 ?

How many terms of G.P. 3, 3^2 , 3^3 , ... are needed to give the sum 120?

How many terms of a G.P. 3,3/2,3/4 ,......... are needed to give the sum 3069/512 ?

How many terms of the A.P : 9, 17, 25... must be taken to give a sum of 636 ?

How many terms of the A.P. : 9, 17, 25, .........must be taken to give a sum of 636 ?

How many terms of the sequence -6, (-11)/2 , -5,.... must be taken to make the sum - 25 ?

How many terms of the A.P. 20, 19 1/3, 18 2/3, ……… must be taken so that their sum is 300?

If the sum to 2n terms of the A.P. 2, 5, 8, 11, .... is equal to the sum to n terms of 57, 59, 61, 63, ....., then n=