youngboymark123
29.03.2020 •
Mathematics
A box contains 6 red marbles and 4 white marbles. one marble is pulled from the box and not replaced. then a second marble is pulled from the box. what is the probability both marbles are white?
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Ответ:
2/15
Step-by-step explanation:
There are 10 marbles in the box
P (1st marble white) = white/total
=4/10= 2/5
We keep the marble
There are now 9 marbles in the box, 6 red and 3 white
P (2nd marble white no replace) = white /total
= 3/9 = 1/3
P(white, white no replacement) = P (1stwhite) P(2nd white no replace)
= 2/5 *1/3
= 2/15
Ответ:
After 9 years:
7,680
Step-by-step explanation:
4%=0.04
1 year = 12,000 x 0.04=480
9 years= 480 x 9 = 4320
12,000-4320= 7,680