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Mathematics
Problem
Calculate the sum of the coefficients in the expansion of
(
2
x
−
3
)
7
(2x-3)^7
(
2
x
−
3
)
7
. a)
128
128
128
b)
−
1
-1
−
1
c)
1
1
1
d)
−
2187
-2187
−
2187
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