Missing term 2

What is the missing term for the Geometric Progression (GP) 3, 15, 75,__, 1875?

Correct result:

a4 =  375

Solution:

a1=3 a2=15  r=a2/a1=15/3=5  a3=75  a4=r⋅ a3=5⋅ 75=375

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