Hello ,I hope you are doing great !I am having a problem with the operations I should use for the following exercise .
" A box contains 10 chips, of which four are red, three are white, two are blue and one is yellow. Red, white, blue and yellow chips are worth $1, $2, $5 and $10, respectively, Two chips are selected at random without replacement from the box. Find the probability that the selected chips are(a) worth at least $5;(b) worth at most $10."
I think it's easier to calculate the probability of the opposite events .For the first question ,selecting chips that are worth less than 5 dollars is equivalent to selecting (2 red chips),(1 red chip and 1 white one)or(2 white ones )however I am confused about the operations that i should use to calculate these events .Selecting 1 red chip and 1 white one is it equivalent to (4/10)*(3/9) or is it equivalent to (4C1 *3C1) /(10C2).
I would very much appreciate it if you could suggest me any courses or videos about probability that could help me with understand the course better .Thank you very much !
" A box contains 10 chips, of which four are red, three are white, two are blue and one is yellow. Red, white, blue and yellow chips are worth $1, $2, $5 and $10, respectively, Two chips are selected at random without replacement from the box. Find the probability that the selected chips are(a) worth at least $5;(b) worth at most $10."
I think it's easier to calculate the probability of the opposite events .For the first question ,selecting chips that are worth less than 5 dollars is equivalent to selecting (2 red chips),(1 red chip and 1 white one)or(2 white ones )however I am confused about the operations that i should use to calculate these events .Selecting 1 red chip and 1 white one is it equivalent to (4/10)*(3/9) or is it equivalent to (4C1 *3C1) /(10C2).
I would very much appreciate it if you could suggest me any courses or videos about probability that could help me with understand the course better .Thank you very much !