GMAT Quantitative Reasoning Practice Test 4

Question : 86 of 100

Marks: +1, -0

On one side of a coin there is the number 0 and on the other side the number 1 . What is the probability that the sum of three coin tosses will be 2 ?

$1/8$
$1 / 2$
$1/5$
$3/8$
$1 / 3$

Validate

Solution:

The coin is tossed three times therefore there are 8 possible outcomes

(2 × 2 × 2)

. We are interested only in the three following outcomes:

(0,1,1),(1,0,1),(1,1,0)

.
The probability requested is

3 / 8

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