Question

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

Answer 1

Step-by-step explanation:

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.

Answer 2

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