36.
The sum of first five multiples of 3 is:

37.
(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......

38.
In an A.P., if d = -4, n = 7, an = 4, then a is

39.
Which term of the A.P. 92, 88, 84, 80, ...... is 0?

40.
If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:

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