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if three arithmetic means are inserted between 11 and 39 find the second arithmetic mean?

Sagot :

18 is the second arithmetic mean  :) and the complete arithmetic mean will be 11, 18, 25, 32, 39. 
Add 7 to the arithmetic mean, 11 to find the second arithmetic mean and to find the third, add 7 to the second arithmetic mean and do it again to until you reach the fifth arithmetic mean, 39.