CBSE Class 11-science Answered
If Sn = 3n2 + 1, then find 'd'.
Asked by | 25 May, 2012, 10:34: PM
Expert Answer
Sn=3n2+1
So, a = S1 = (3x1)+ 1 = 4 [Substituting n=1]
Then, S2 = (3x22) + 1 = 13 [Substituting n=2]
Now, a2 = S2-a = 13-4 = 9
d = a2-a = 9-4 = 5
Answered by | 26 May, 2012, 10:31: AM
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