In a class of 30 students, 6 have a brother and 12 have a sister. There are 14 students who do not have any siblings. What is the prob

Question

In a class of 30 students, 6 have a brother and 12 have a sister. There are 14 students
who do not have any siblings. What is the probability that a student chosen randomly
from the class has a brother and a sister?
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niczorrrr 2 days 2021-07-22T01:42:35+00:00 1 Answers 0 views 0

Answers ( )

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    2021-07-22T01:44:01+00:00

    30 students

    14 have no siblings

    that leaves 16 with siblings

    6 have brothers and 12 have sisters which = 18 so 2 of the students have both a brother and a sister

    2/30 students have a brother and a sister

    1/15 chance

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )