class 11

Math

Algebra

Sequences and Series

Let $a_{1},a_{2},a_{3},?a_{10}$are in G.P. if $a_{1}a_{3} =25$ then $a_{5}a_{9} $ is equal to (A) $5_{4}$ (B) $4.5_{4}$ (C) $4.5_{3}$ (D) $5_{3}$

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