Question

The first and the last term of an AP are 2 and 20
respectively if there are 20 terms in AP find CD
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Answer 1

Answer:

18/19

Step-by-step explanation:

sum of AP =

n/2 (a+l) = n/2 (2a+(n-1)d)

=>(a+l) =(2a+(n-1)d)

=>l-a =(n-1)d

=>20-2=(20-1)d

=>18 =19d

=>d=18/19