How many distinct pairs are possible


Discuss the below:

Q: Out of 11 people applying for an assembly job, 3 cannot do the work. Suppose two persons will be hired.

(a) How many distinct pairs are possible?

(b) In how many of the pairs will 0 or 1 people not be able to do the work?

(c) If two persons are chosen in a random manner, what is the probability that neither will be able to do the job?

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