Geometric progression

Fill 4 numbers between 4 and -12500 to form geometric progression.

Correct result:

a1:  -20
a2:  100
a3:  -500
a4:  2500

Solution:

q=(125004)14+1=5  a1=4(5)=20
a2=4(5)(5)=100
a3=4(5)(5)(5)=500
a4=4(5)(5)(5)(5)=2500



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