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The 5th term of an AP is 20 and the sum of its 7th and 11th terms is 64. The common difference of the AP is (a) 4 (b) 5 (c) 3 (d) 2

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The 5th term of an AP is 20 and the sum of its 7th and 11th terms is 64. The common difference of the AP is 

(a) 4 (b) 5 (c) 3 (d) 2

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1 Answer

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

Thus, the common difference of the AP is 3.

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