check my answer? will medal. Q) How many three color patterns can be made using the colors in the rainbow: red, orange, yellow, green, blue, indigo, and violet if the color can only be used once?
my answer) 42?

Question

check my answer? will medal. Q) How many three color patterns can be made using the colors in the rainbow: red, orange, yellow, green, blue, indigo, and violet if the color can only be used once?
my answer) 42?

cwrw238 · Answer

I am assuming that the order of the 3 colours is not important.
then the number required is the number of combination of 3 from 7.

cwrw238 · Answer

this is  7 *6*5
           ------  =  35
            3*2*1

anonymous · Answer

thank you @cwrw238

cwrw238 · Answer

yw