31.
For an A.P. if a25 - a20 = 45, then d equals to:

32.
For A.P. T18 - T8 = ........ ?

33.
Which term of the A.P. 24, 21, 18, ............ is the first negative term?

34.
15th term of A.P., x - 7, x - 2, x + 3, ........ is

35.
If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :

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