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Mathematics
Mathematics
Problem
The first term of a geometric progression is
4
4
4
and the common ratio is
−
2
-2
−
2
. Determine
S
4
S_4
S
4
, the sum of its first four terms. a)
60
60
60
b)
20
20
20
c)
−
20
-20
−
20
d)
−
60
-60
−
60
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