Find the nth term and hence the 20th term of series `2.4+4.6+6.8+…….. Also find the sum of its 20 terms.

Find the nth term and then the sum to n terms of the series 3.5 +4.7+ 5.9 +....

Find the nth term and the sum to n terms of the series 1.2+ 2.3 +3.4 + ...

Find the nth terms and the sum to n term of the series : 1.4.7+2.5.8+3.6.9 + ...

Find the nth term and 20th term of the sequance : 9,5,1,1-3………

Find the nth term and deduce the sum to n terms of the series 4+11+22+37+ 56 + ....

If the 8th term of an A.P. is 37 and the 15th term is 15 more than the 12th find the A.P. Also find the sum of first 20 terms of this A.P.

Find the nth term and deduce the sum of n terms of the series 4+11+22+37+56+………….

The nth term of a series is 3^n + 2n ; find the sum of first n terms of the series.

Find the 5th and nth term of sequence -2,-6,-18,"…."

Find the n^(th) term and sum to n terms of the series 8, 14, 22, 32, 44,.....