x = 20 because x+30=3x-10, so 2x=40, and x=20.
There is a problem with the picture.
The answer is D
1200 factors as 2^4 * 3 * 5^2 = 2 * 2 * 2 * 2 * 3 * 5 * 5 = 4 * 4 * 3 * 5 * 5
So....the number of different identifiable roll sequenes =
5! 120
_______ = ____ = 30
2! * 2! 4
Hi Guest! This is the harmonic mean problem. The answer is \(\frac{2}{\frac{1}{30} + \frac{1}{20}}=24\)
who is good at probability? Cphil?
who is online right now?
what do you mean?
I forgot. Please help though. I beg you.
