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febrero=10×2=20
marzo=10×4=40
abril=10×8=80
mayo=10×16=160
.
.
.
diciembre=10×2^11=20480
nos piden:
10+20+40+80......20480
r=2
1er termino=10
num.de terminos=12
suma=10(2^12-1)/(2-1)
suma=10(4095)/1
suma=40950
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