Given 5 flags of different colours, how many different signals ca… - Vidyadip

MCQ

Given $5$ flags of different colours, how many different signals can be generated, if each signal requires the use of $2$ flags, one below the other:

A
$18$
✓
$20$
C
$19$
D
$23$

✓

Answer

Correct option: B.

$20$

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