The only time you can be so certain that you have picked 2
brown socks is when there are no more white socks and black socks. This means
that to be 100% sure that you have picked 2 brown socks, you must pick all 12
white socks and all 18 black socks and only then you can pick 2 brown socks
without looking. Therefore the total number of socks that should be picked is:
Total number of socks = 12 white socks + 18 black socks + 2
brown socks
Total number of socks = 32 socks
A total picking of 32 socks is required to be certain
without looking that 2 brown have already been chosen.
212 + 28% = <span>271.36</span>
<span>Hope it helps! :D</span>
What do you mean?!? I don’t understand
There are 60 seconds in a minute, so divide 450 by 6 and you get that his first mile was in 75 minutes.
(1/4)^-2 - (5^0 x 2) x 1^-1 =
(4/1)^2 - (1 x 2) x 1 = 16-2 = 14
If you raise something to the power of -2, swap numerator and denominator and remove the minus.
So (1/4)^-2 = 4^2 = 16
Also 1^-1 is just 1, not -1.
