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
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If k - 1, k + 1 and 2k + 3 are in A.P. , then the value of k is
-2
2
4
The 21st term of an A.P. whose first two terms are -3 and 4 is
17
137
143
-143
In an A.P. if a = 1, an = 20 and Sn = 399, then n is
19
21
38
42