If a,d and Sn are first term, common difference and sum of first nth t – McqOptions

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1.	If a,d and Sn are first term, common difference and sum of first nth terms of series, then Sb =
A.	n/2[2a+(n-1)d]
B.	n/2[a+(n-1)d]
C.	n/[2a+(n-1)d]
D.	a+(n-1)d
Answer» B. n/2[a+(n-1)d]

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