Question #19d49

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Question #19d49

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Answer 1 · 2017-04-10T04:58:06

The probability of drawing two marbles is the product of drawing the each of the blue marbles.

The product of drawing the first marble is 4/16 or 1/4

The product of drawing the second marble is 3/15 = 1/5

The overall probability is

$\frac{1}{4} \times \frac{1}{5} = \frac{1}{20}$ $1/4 xx 1/5 = 1/20$

Answer 2 · 2017-04-10T06:14:51

Probability of drawing two blue marbles $= \frac{1}{20}$ $=1/20$

Explanation:

Red Marbles $= 7$ $=7$
Blue Marbles $= 4$ $=4$
Green Marbles $= 5$ $=5$

Total Marbles $= 7 + 4 + 5 = 16$ $=7+4+5=16$

The probability value to be calculated as follows:

Probability of drawing two blue marbles = Number of ways two blue marbles can be taken from 4 blue marbles [number of favourable events] / Number of ways two marbles can be taken from the 16 marbles [Total Number of events]

Number of ways two blue marbles can be taken from 4 blue marbles [number of favourable events] $= n C r = 4 C 2 = 6$ $=nCr = 4C2 = 6$

Number of ways two marbles can be taken from the 16 marbles [Total Number of events] =nCr= 16C2=120#

Probability of drawing two blue marbles $= \frac{6}{120} = \frac{1}{20}$ $=6/120=1/20$

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Question #19d49

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