p(outcome) = (number of desired outcomes)/(total number of outcomes)
The total number of outcomes is the sum of the numbers of the marbles.
4 + 6 + 2 = 12
The desired outcome is selecting a red ball. There are 2 red balls, so the number of desired outcomes is 2.
p(red) = 2/12 = 1/6
It’s c just to let you know I have done this before
Method 1:
4(754)
=4(700+50+4)
=2800 + 200 + 16
=3000+16
=3016
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Method 2:
4(754)
=4(250+250+250+4)
=1000+1000+1000+16
=3016