Afton

thx your a life saver 

−33/5=𝑥

ok what deos the X repsent in that math problem 

P (  odd single digit number )  = 

( 5 odd single digits / 10 non-negative single digits)  = (5/10)  = 1/2

P (positive single digit number )  = 

(9 positive single digits / 10 non-negative single digits)  = 9/10

The total probability is   (1/2) (9/10)  =  9/20

Here's (b)....it's pretty much an extension of (a)

1000/7 = 142 numbers that have at least 1 factor of 7

1000/49 = 20 numbers that have at  an additional factor of 7

1000/343 =  2 numbers that have a third factor of 7

So.........    142 + 20 + 1 =  163

And 7^163 will divide 1000!   ...so n = 163