I'm gonna say maybe 10..... yah 10
here's why
Answer:
In can pick in 10 ways.
Solution:
John has green, red, yellow, purple, orange, and blue paint = total 6 colours
he wants to have 4 different colours in the painting.
But in those 4 colors green is must, it should always be there.
So except green we have total 5 colours (red, yellow, purple, orange, and blue) from which we can pick any 3 colors(as green will be one in four colours).
Then we can choose 3 colours from 5 colours in x ways.
x ways = = \left(\frac{5 !}{3 !(5-3) !}\right)=(3!(5−3)!5!)
=\left(\frac{5 !}{3 ! \times 2 !}\right)=(3!×2!5!)
=\frac{5 \times 4 \times 3 !}{3 ! \times 2 !}=3!×2!5×4×3!
=\frac{5 \times 4}{2}=25×4
=\frac{20}{2} = 10=220=10
