Question

In a class of 30 students with a 1:1 gender ratio, how many 1 girl-1 boy pairs can be made on a given day if 3 girls are on leave?
13 is not correct answer​

Answer 1

Answer:

Solution

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Correct option is A)

Number of ways of selecting 2 students from 30 students = 30C2 ways

= ( 30 x 29 )/2

= 15 x 29 ways

Number of ways of selecting 2 girls from 12 girls = 12C2 ways

= 12 x 11 / 2

= 6 x 11

Thus, probability that both selected students are girls

= ( 6 x 11 ) / ( 15 x 29 )

= 22 / 145

Explanation:

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Answer 2

Methane is a chemical compound with the chemical formula CH₄. It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas.

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