write first four terms of the ap when the first term a and the common difference a=12,d=3
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Given: a = 12 and d = 3
first term = a = 12
second term = a+d = 12+3 = 15
third term = a+2d = 12+2(3) = 18
fourth term = a+3d = 12+3(3) = 21
Thus,
A.P. is 12,15,18,21,..........
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