Insert 4

Insert 3 arithmetic means between 3 and 63.

Correct result:

a =  18
b =  33
c =  48

Solution:

a1=3 d=(63−a1)/(5−1)=(63−3)/(5−1)=15  a=a1+d=3+15=18
b=a+d=18+15=33
c=b+d=33+15=48

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