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Signals using exactly 3 flags out of 5 different flags number:

A120
B45
C60
D20
Answer & Solution
Correct answer: C. 60
1. The places offer 5, then 4, then 3 choices. 2. Multiply them. 3. The count is 60. _Source: syllabus Mathematics, Chapter 7, Permutations and Combinations._
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