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In an AP, the first term is -4, the last term is 29 and the sum of all its terms is 150. Find its common difference.

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In an AP, the first term is -4, the last term is 29 and the sum of all its terms is 150. Find its common difference.

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Suppose there are n terms in the AP.

Thus, the AP contains 12 terms. 

Let d be the common difference of the AP.

Hence, the common difference of the AP is 3.

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