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Question

Let a1,a2,a3,....,a10 be in G.P. with a1>0 for i=1,2,...10 and S be the set of pairs (r,k),rkN (the set of natural numbers) for which
∣ ∣ ∣logear1ak2logear2ak3logear3ak4logear4ak5logear5ak6logear6ak7logear7ak8logear8ak9logear9ak10∣ ∣ ∣=0
Then the number of elements in S, is :

A
Infinitely many
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B
4
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C
10
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D
2
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