Question

Answer it guys Please​

Answer 1

Answer:

Let a is the first term and d is the common difference of an AP

a21 = a + ( 21 -1)d = a + 20d

a7 = a + (7 -1)d = a + 6d

now,

a +20d -a -6d = 84

14d = 84

d = 6 ( answer)

Step-by-step explanation:

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