In the 20th row of the triangle 1
2 3
4 5 6 7 10 (A) last term = 210 (B) first term = 191 (C) sum = 4010 (D) sum = 4200

If the sum of the first 14 terms of an AP is 1050 and its first term is 10, find the 20^(th) term.

The sum of the series 1 + 2 xx 3 + 3 xx 5 + 4 xx 7+ ...upto 11th term is

If the 10^(th) term of an A.P. is 1/5 and its 20^(th) term is 1/3 , then the sum of its first 150 terms is:

It the 10^(th) term of an A. P. is 1/20 and its 20^(th) term is 1/10, then the sum of its first 200 terms is :

If the sum of first 14 terms of an A.P. is 1050 and its first term is 10, find the 20^(th) term.

Find the 20th term of an A.P. whose 5th term is 15 and the sum of its 3rd and 8th terms is 34.

If the sum of the first n terms of an A.P. is 4n - n ^(2), what is the first term (that is S _(1) ) ? What is the sum of first two terms? What is the second term ? Similarly, find the 3 ^(rd), the 10^(th) and ten n ^(th) terms.

The 7th term of an H.P. is (1)/(10) and 12th term is (1)/(25) Find the 20th term