Open Question: Maths problem- Geometric series?
ar(1+r) = 280 ......... [ I ]
ar^4(1+r) = 4375 .... [ II ]
ar^4(1+r) = 4375 .... [ II ]
[ II ] / [ I ]
r^3 = 4375/280 which yields
r = 2.5
substituting in [ I ] yields a = 32
ans: a = 32, r = 2.5
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