a number is selected at random from {1,2,3,..1000}
a) chance the num is divisible by 7
b) chance the num is divisible by 11
c) chance divisible by 7 or 11
d) divisible by 7 or 11 but not both

Question

a number is selected at random from {1,2,3,..1000}
a) chance the num is divisible by 7
b) chance the num is divisible by 11
c) chance divisible by 7 or 11
d) divisible by 7 or 11 but not both

bibby · Answer

I have a and b$$\lfloor \frac{1000}{7} \rfloor$$
$$\lfloor \frac{1000}{11} \rfloor$$

♪chibiterasu · Answer

It's clearly not D, because choosing that would remove the purpose of A and B, so we can scratch that.

anonymous · Answer

c

♪chibiterasu · Answer

Wow much lag o-o

bibby · Answer

wot
I just need to come with the probabilities for each. I think c would be floor of a+b/1000

anyhow brb calc final