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Let a 1 , a 2 , a 3 ,..... be a G.P. of increasing positive numbers. Let the sum of its 6 th and 8 th terms be 2 and the product of its 3 rd and 5 th terms be 9 1 . Then 6(a 2 + a 4 ) (a 4 + a 6 ) is equal to :

1. 3
2. 3 3
3. 2
4. 2 2

Correct answer: 3

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