To Find Nth Term And Sum Of Nth Term

Find the nth term and sum to n terms of the series 12+40+90+168+280+432+"...." .

find the nth term and the sum of the series 2,5,12,31,86...

(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 nth term of an HP

41: Find the nth term and the sum of n term of the series 2+12+36+80+150+252+.........

Find the nth term and the sum of n term of the series 6+9+21+69+261+ ………………...

If the sum of n terms of a series be a+bn+cn^(2) find the nth term and the nature of the series

Find the sum of n terms of the series whose nth terms is (i) n(n-1)(n+1) .

Find the sum of n terms of the series whose nth terms is (ii) n^(2)+3^(n) .

Find the nth term and the sum of n terms of the series 1.2.4+2.3.5+3.4.6+....