The question is of NCERT, Ex. 5.1 Q.2 (iv). In the given question you have to find out the first four terms from the information which has been provided above . This question is from of A.P.

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Solution:a= – 1,d= 1/2Let trhe A.P be

a_{1}, a_{2}, a_{3}, a_{4}, a_{5}…a_{2}=a_{1}+d= -1+1/2 = -1/2a_{3}=a_{2}+d= -1/2+1/2 = 0a_{4}=a_{3}+d= 0+1/2 = 1/2The first 4 terms of the A.P are -1, -1/2, 0 and 1/2.