Attempt any five sub-question from the following:
Find S2 for the A.P. 3, 5, 7, 9,…
Given A.P. 3, 5, 7, 9,……
Let a1 be the first term and d be the common difference of the A.P.
a1 = 3,
a2 = 5
d = a2 – a1
d = 5 – 3 = 2

∴ 
S2 = 8
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