Question

what is the common difference of A.p in which a21-a7= 24​

Answer 1

Answer:

a=12/7

Explanation:

21a-7a =24

=(21-7)a= 24

=a= 24/14=12/7

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and thus the common difference is 21-7 = 14

Answer 2

Answer:

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

a

21

=a+(21−1)d=a+20d

a

7

=a+(7−1)d=a+6d

a

21

−97=84

a+20d−a−6d=84

14d=84

d=6

Explanation:

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