If Sn=n(n+1)/2 , find first two tearms of ap
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Answer:
The first two terms of AP = 1,2.
Step-by-step explanation:
Sn = n(n+1)/2
A1 = 1(1+1)/2 = 2/2 = 1
S2 = 2(2+1)/2 = 3
But, S2 = A1+A2
=> A2 = 2
Hope it helps.....
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