Question

Let there be 3 red, 2 yellow and 2 green signal flags. how many different signals are possible if we wish to make signals by arranging all of them vertically on a staff?

Answer 1

3×2×2=18..hope it can help

Answer 2

Answer:

The number of signals can be formed = 210

Step-by-step explanation:

We have,

Number of red flags = 3

Number of yellow flags = 2

Number of green flags = 2

Total number of flags = 3 + 2 + 2 = 7

$\text {The number of signals can be formed} = \dfrac {7!}{3! \times 2! \times 2!}\\\\= \dfrac {7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}{3 \times 2 \times 1 \times  2 \times 1 \times  2 \times 1 }\\\\= 210$

So, The number of signals can be formed = 210