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The 4th term of an AP is 11. The sum of the 5th and 7th terms of this AP is 34. Find its common difference.

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The 4th term of an AP is 11. The sum of the 5th and 7th terms of this AP is 34. Find its common difference.

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Let a be the first term and d be the common difference of the AP. Then,

Hence, the common difference of the AP is 3.

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