write first four terms of the AP, when the first term a and the common difference d are given as follows. (1) a= -1, d= ½.
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an = a+(n-1)d
a1 = -1
a2 = -1 + 1/2 = -2/2 +1/ 2 = -1 /2
a3 = -1/2 + 1/2 = 0
a4 = 0 + 1/2 = 1/2
-1 , -1/2 ,0 ,1/2
a1 = -1
a2 = -1 + 1/2 = -2/2 +1/ 2 = -1 /2
a3 = -1/2 + 1/2 = 0
a4 = 0 + 1/2 = 1/2
-1 , -1/2 ,0 ,1/2
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