Related Questions
The 21st term of an A.P. whose first two terms are -3 and 4 is
17
137
143
-143
If the first term of an A.P. is -5 and the common difference is 2, then the sum of its first 6 terms is
0
5
6
15
In an A.P. if a = 1, an = 20 and Sn = 399, then n is
19
21
38
42
In an A.P., if a = -5, l = 21 and S = 200, then n is equal to
50
40
32
25