Question

What is the common difference of an A.P. in which​

Answer 1

Answer:

An arithmetic sequence is a sequence that has the property that the difference between any two consecutive terms is a constant. This constant is called the common difference. If a1 is the first term of an arithmetic sequence and d is the common difference, the sequence will be: {an}={a1,a1+d,a1+2d,a1+3d,…}

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

hope it helps you ✌️