1.

Which of the following statement (s) is (are) correct ?

Answer»

Sum of the RECIPROCAL of all the n harmonic means inserted between a and b is equal to n times the harmonic mean between two GIVEN numbers a and b.
Sum of the cubes of first n natural NUMBER is equal to square of the sum of the first a natural numbers.
If `a , A_(1), A_(2), A_(3), ….., A_(2n), b` are in A.P. then `sum _( I =1) ^(2n) A_(L) =n (a+b).`
If the first term of the geometric progression `g _(1), g _(2), g _(3), ……, oo` is unity, then the value of the common ratio of the progression such that `(4g _(2)+5g _(3))` is MINIMUM equals `2/5.`

Answer :B::C


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