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Sunday, March 19, 2017

Sequence of product of sums and reciprocal sums

Similar to the last two problems, but no triangles this time.

Suppose t1,t2,,tn, are a sequence of positive reals.

Let

Sn=ni=1ti=t1+t2++tn

and

Rn=ni=11ti=1t1+1t2++1tn


Show that:

If SkRk<k2+1 for infinitely many k, then all the tis must be equal.

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