f.3 probability

i)

P(At least 1 red ball)

= 1 - P(No red ball)

= 1 - P(white or yellow 2 times with replacement)

= 1 - [(4+1)/(4+2+1)] [(4+1)/(4+2+1)]

= 1 - (5/7)(5/7)

= 24/49

there are 4 white balls, 2 red balls and 1 yellow ball in a bag. two balls are drown from the bag with replacement.find the probability of:
i)at lease 1 red ball
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P(at least 1 red ball)
(2/7)(4/7)(2)+(2/7)(2/7)+(2/7)(1/7)(2)
(16/49)+(4/49)+(4/49)
24/49