How many terms of the AP is `-6,-11/2,-5`,…. Are needed to give the sum `-25`?

How many terms of the A.P. 17 ,15, 13 , 11,... must be added to get the sum 72?

How many terms of the AP:9,17,25,….. Must be taken to give a sum of 636?

How many terms in the series 3,6,9,12,……111?

How many terms of the A.P. 9,17,25.....must be taken so that their sum is 636.

How many terms of the AP.3,7,11,15,….will make the sum 406____ a)10 b)12 c)14 d)40

Which term of the AP 5,15,25,…… is 130 more than the 31(th) term?

Is - 450 a term of the A.P. 8, 5, 2, ... ?

If 18th term of an A.P. is 52, determine the sum upto 35th term.

If the sum of first nine terms of an A.P is 171 and that of first 24 terms is 996,find the sum of first 41 terms.

Is the series 1,6,11,16,21,……. Is an AP?