Question 41931: Find the three arithmetic means between 21 and 13.
Answer by fractalier(6550)   (Show Source):
You can put this solution on YOUR website! We subtract them and divide by four to find the common difference d. The intermediate means tells us there are four increments, thus we divide by four...so
21 - 13 = 8
8 / 4 = 2
Thus d = 2 and our missing means are
21, 19, 17, 15, 13
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