jacob's answer to Jason's Junior College 1 H2 Maths Singapore question.
Any workings?
complement method :
P (exactly two are the same colour)
= 1 - P(all 3 balls are same colours)
= 1 - P(all 3 are blue)
= 1 - (8/10 x 7/9 x 6/8)
= 1 - 336/720
= 1 - 7/15
= 8/15
P (exactly two are the same colour)
= 1 - P(all 3 balls are same colours)
= 1 - P(all 3 are blue)
= 1 - (8/10 x 7/9 x 6/8)
= 1 - 336/720
= 1 - 7/15
= 8/15
https://www.thestudentroom.co.uk/showthread.php?t=2629211&page=25
The other method is available in the link
The other method is available in the link
Thank you!
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