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The set {sum(n=1)^oo(an)/(1 0^n): a1=5, ...

The set `{sum_(n=1)^oo(a_n)/(1 0^n): a_1=5, a_2=3, & a_n in {0, 1 ,.. ,9}"for all"n >=3}`coincides with the set

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Let a_1,a_2,a_3 …. a_n be in A.P. If 1/(a_1a_n)+1/(a_2a_(n-1)) +… + 1/(a_n a_1) = k/(a_1 + a_n) (1/a_1 + 1/a_2 + …. 1/a_n) , then k is equal to :

Let a_1,a_2,a_3 …. a_n be in A.P. If 1/(a_1a_n)+1/(a_2a_(n-1)) +… + 1/(a_n a_1) = k/(a_1 + a_n) (1/a_1 + 1/a_2 + …. 1/a_n) , then k is equal to :