How many terms of the arithmetic series `-6,-11/2,-5,..` has the sum of `-25`?

How many terms of the series 3,6,12,.. having sum 381?

How many terms of the arithmetic progression 45, 39, 33,….. Must be taken so that their sum is 180? Explain the double answer.

How many terms of the arithmetic progression 45, 39, 33,….. Must be taken so that their sum is 180? Explain the double answer.

How many terms of the series (2)/(3)-1+(3)/(2) … has the sum (463)/(96) ?

The middle term of arithmetic series 3, 7, 11...147, is

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… are needed to give the sum -25?

The number of terms in arithmetics series 7, 11, 15,...,139 is

How many terms of the series –12, – 9, – 6,... must be taken that the sum may be 54?

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