Insert 3

Insert five arithmetic progression members between -7 and 3/2.

Correct result:

a2 =  -5.5833
a3 =  -4.1667
a4 =  -2.75
a5 =  -1.3333
a6 =  0.0833

Solution:

a1=−7 a7=3/2=32=1.5  a7=a1+6d  d=(a7−a1)/6=(1.5−(−7))/6=1712≐1.4167  a2=a1+d=(−7)+1.4167=−6712=−5.5833
a3=a2+d=(−5.5833)+1.4167=−256=−4.1667
a4=a3+d=(−4.1667)+1.4167=−114=−2.75
a5=a4+d=(−2.75)+1.4167=−43=−1.3333
a6=a5+d=(−1.3333)+1.4167=0.0833

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