1. Find the average of first 30 multiples of 7.





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  • By: anil on 05 May 2019 02.04 am
    First thirty multiples of 7 will form an arithmetic progression : 7,14,21,.......,210 First term, $$a=7$$ and common difference, $$d=7$$ Sum of $$n$$ terms = $$frac{n}{2}(a+l)$$ => $$S_{30}=frac{30}{2}(7+210)$$ = $$15 imes217$$ Now, average of 30 terms = $$frac{15 imes217}{30}$$ = $$frac{217}{2}=108.5$$ => Ans - (D)
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