Find first four terms of AP when the first term is -1 and the common difference is 1/2.

The correct answer is -1, -1/2, 0, 1/2

a = - 1, d = 1/2

First term, a = - 1

Second term, a + d = - 1 + 1/2 = - 1/2

Third term, a + 2d = - 1 + 2(1/2) = - 1 + 1 = 0

Fourth term, a + 3d = - 1 + 3(1/2) = - 1 + 3/2 = 1/2

The first four terms of the AP are - 1, - 1/2, 0, 1/2