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c
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Correct option is B
∵a1,a2,a3,………,a20 are A.M's between 13 and 67, then 13,a1,a2,…….,a20,67 are in A.P. We know that if a1,a2,a3,………,an are A ⋅M′ s between a and b , a1+a2+a3+………..+an=na+b2 then ∴a1+a2+a3+………..+a20=2013+672=800Similar Questions
Between 1 and 31 are inserted M arithmetic means so that the ratio of the 7th and (M - 1) th means is 5:9, then the value of m is
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