bree74
bree74
15-05-2017
Mathematics
contestada
Math sequence problem
Respuesta :
CRAZYBU113T
CRAZYBU113T
15-05-2017
The above series is a Geometric series because:
t2/t1 = t3/t2 --> 14/7 = 28/14 --> 2 = 2
and common ratio (r)=2
The for S12 we have,
S12 = a(1 - r^12) /(1-r) where, a = first term = 7
or, s12 = 7*(1 - 2^12) / (1 - 2)
= 28665
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