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If the sum of first m terms of an AP is the same as the sum of its first n terms, show that the sum of its (m +n) terms is zero. Or The sum of n terms of two arithmetic progressions are in the ratio (3n+8) : (7n+15). Find the ration of their 12th terms. |
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Answer» If the sum of first m terms of an AP is the same as the sum of its first n terms, show that the sum of its (m +n) terms is zero. Or The sum of n terms of two arithmetic progressions are in the ratio (3n+8) : (7n+15). Find the ration of their 12th terms. |
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