Question

What is the common difference of an A.P. in which a21-a7=84 ?​

Answer 1

Answer:

d is 6

Step-by-step explanation:

how? follow attachment

Answer 2

Answer:

✔a21-a7=84

⚫a-20d-a+6d=84

⚫-14d=84

⚫-d=84/14

⚫-d=6

⚫d=-6

So,the common difference is-6.

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