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Mathematics, 25.11.2020 01:40 JvGaming2001

A signal can be formed by running different colored flags up a pole, one above the other. Find the number of different
signals consisting of 7 flags that can be made if 3 of the flags
are white, 3 are red, and 1 is blue.
A) 15
B) 9
C) 140
D) 35

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