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If the variance of the terms in an increasing A.P., b1 , b2 , b3 ,....b11 is 90, then the common difference of this A.P. is ......

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If the variance of the terms in an increasing A.P., b1 , b2 , b3 ,....b11 is 90, then the common difference of this A.P. is ......

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Let a be the first term and d be the common difference of the given A.P. Where d > 0

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