this is what i got from the 2nd problem
of the total 7 digits in the number he knows the first 5 that leaves 2 for him to find out with 0 not being the last number so he knows 10 possible for the 6th and 9 possible for the 7th (not 0) 10 * 9 = 90 possible numbers
then it takes 20 seconds to try each one so 90 * 20 = 1800 seconds = 30 minutes
I'm I correct?
#3 I got this answer
=$13,100. expected profit
Is this right
Ok so I really need help with problem 1 I have no clue
correct on 2.
correct on 3.
1) what is 1/7 * 1/5 ?
So the answer for #1 is 1/35 is that I have to do for that problem though?
This is how it works.
To draw a 4 out of 7 balls, you have 1 success out of 7 possible events.
To draw a 2 out of 5 balls, you have 1 success out of 5 events possible.
For both of them to happen, you use the rule of multiplication.
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