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Let a 1 , a 2 , a 3 ,.... be an A.P. with a 6 = 2. Then the common difference of this A.P., which maximises the product a 1 a 4 a 5 , is :

1. 2 3
2. 5 6
3. 5 8
4. 3 2

Correct answer: 5 8

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