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The sixth term of an A.P. is equal to 2. The value of the common difference of the A.P. which makes the product a_1 a_4 a_5 least is given by : |
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Answer» `8/5` =a(a+3d)(a+4d) =(2-5d) (2-2d)(2-d) `P=2(4-16d+17d^2-5d^3)` `P=2(-16 + 34d-15d^2)=0` `d=2/3` and `8/5` For LEAST product d=2/3 |
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