Let x be the number of teachers among 3 people selected randomly from a group  consisting of 3 students, 7 teachers and 1 custodian. (a) Find P x( 1) = . (b) Find P x( 2) = .

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Let x be the number of teachers among 3 people selected randomly from a group 
consisting of 3 students, 7 teachers and 1 custodian.
(a) Find P x( 1) = .
(b) Find P x( 2) = .

Expert Solution
Step 1: Introduction

Probability: Probability is the ratio of favourable outcomes to all other potential outcomes of an event. 
The symbol x can be used to express the quantity of successful outcomes for an experiment with 'n' outcomes.
The following formula can be used to determine an event's probability.

Probability(Event) = Positive Results/Total Results 

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