Artificial intelligent assistant

Probability How many samples of five contian exactly one chip Hey guys I hav a task which I cannot solve, can u help me ? 140 semiconductor chips are inspected by choosing a sample of five chips. Assume 10 of the chips do not conform to customer requirements. How many diffrent samples are possible -->140/5=28 am i right ? and How many samples of five contain exactly one nonconforming chip ?

In general if you have $n$ objects, and you want to choose $k$ of them, there are $\binom{n}{k}$ ways to do so, where $$ \binom{n}{k} = \frac{n!}{k! (n-k)!}.$$

So in your case $n= 140$ is the number of chips, and we want to take samples of size $k=5$, so there are $\binom{140}{5} = 416,965,528$ ways to sample the chips.

To count the number of samples (of size 5) containing exactly one of the 10 faulty chips: first select the faulty chip, there are $\binom{10}{1}=10$ ways to do this. Now choose any four chips from the remaining 130 working chips, there are $\binom{130}{4}$ ways for this, so in total there are $$ \binom{10}{1} \binom{130}{4} = 10 * 11358880 = 113,588,800$$ possible choices.

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