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Question
If sum of n terms is given by Sn = 3n2 + 5n, then the common difference of this AP is:
If sum of n terms is given by Sn = 3n2 + 5n, then the common difference of this AP is:
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Solution
The correct option is B 6
S1 = 3 + 5 = 8 = a1
S2 = 12 + 10 = 22 = a1 + a2
a2 = 22 – 8 = 14
d = a2 – a1 = 14 – 8 = 6
6
S1 = 3 + 5 = 8 = a1
S2 = 12 + 10 = 22 = a1 + a2
a2 = 22 – 8 = 14
d = a2 – a1 = 14 – 8 = 6
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22
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