The following question is from NCERT Book Ch.-5 Excersice 5.1 Question no. 3(i) Give the 1st term and find the Common difference in the given series. Give the solution of the question.
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Solution:
3, 1, – 1, – 3 …
1st term, a = 3
Common difference (c.d), d = 2nd term – 1st term
1 – 3 = -2
d = -2