Common difference 2

What is the common difference of the arithmetic sequence with 20 terms, whose first term is 5a+b and the last term is 43a+20 b?

Correct answer:

d = 2a+b

Step-by-step explanation:

a1=5a+b a20 = 43a+20b n=20  a20 = a1+ 19 d 43a+20b = 5a+b + 19d 19d = 38a+19b  d=2a+b

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