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Let S = {a_1, a_2,…... a_n} where a_1, a_2………, a_n are nonzero real numbers. If the number of ordered pairs(a_(i),a_(j)),with i < j such that a_(i)a_(j) gt 0is 99 and the number of ordered pairs (a_(i),a_(j)) with i lt jsuch that a_(i)a_(j) lt 0is 91, then n is equal to

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Answer :C


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