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 the sum of n terms of the series 1.2.4+2.3.5+3.4.6+....

Find the 20th term of the series 2xx4 + 4xx6 + 6xx8 +...+n terms.

Find the 20th term and nth term of the G.P 5/2,5/4,5/8,….

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

Find the 20^(th) term of the series 2xx4+4xx6+6xx8+ … to n terms

(i) The sum of the first n terms of an AP is ((5n^(2))/(2) + (3n)/(2)) . Find the nth term and the 20th term of this AP. (ii) The sum of the first n terms of an AP is ((3n^(2))/(2) + (5n)/(2)). Find its nth term and the 25th term.

Find the sum of first n terms of an AP whose n^(th) term is 5-6n .find the sum of its first 20 terms

Find the 20th term and the sum of 20 terms of the series: 2xx4+4xx6+6xx8+..........

Find the 20th term and the sum of 20 terms of the series: 2xx4+4xx6+6xx8+..........

The 14th term of an A.P. is twice its 8th term. If its 6th term is -8, then find the sum of its first 20 terms.