Question

10. There are 30 socks in a drawer. 60% of the
socks are red and the rest are blue. What is
the minimum number of socks that must be
taken from the drawer without looking in order
to be certain that at least two blue socks have
been chosen?
(1) 2
(2) 3
(3) 14
(4) 20​

Answer 1

Answer:

no.of red socks=60*30/100=18

if u draw out 18 socks...there's a possibility that all of them are red

if u draw out 19 socks...one of them has to be a blue one

and if u draw 20 socks...then deifinitely 2 of them are blue socks

so.....the answer is 20.

Step-by-step explanation:

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Answer 2

Answer:

Your first step is to calculate 60% of 30, which yields 18. Now, you must be sure you picked at least 2 blue socks. The only way is to pick all the other socks plus 2 blue socks. In this case, you would have to pick 18 red socks plus the 2 blue ones. Hence, answer is 20. If you had 4 green, 6 yellow and 8 red socks, the answer would be the same. You would have to pick all of those pluse 2 blue ones.

Step-by-step explanation:

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