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If the sum of the first ten terms of an `A.P` is four times the sum of its first five terms, the ratio of the first term to the common difference is: |
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Answer» Correct Answer - `(1)/(2)` Let a be the first term and d be the common difference of A.P. According to the question. `S_(10)=4S_(5)` `rArr5[2a+9d]=4xx5/2[2a+4d]` `rArr10a+45d=20a+40d` `10a-5d=0` `rArra/d=1/2` |
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