The sum of the series 3.5 + 7 + 10.5 + 14 +.......+ 17 term is
Answers 1
Answer: 535.5
Step-by-step explanation:
sn=n/2(2a+(n-1)d)
sn=17/2(2*3.5+(17-1)3.5)
sn=17/2(7+(18*3.5)
sn=17/2*63
sn=535.5
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