Solve the system of linear equations by substitution. Check your solution.
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Let 
be the random variable representing the number of genes that do get mutated. Here 
denotes a binomial distribution with parameters 
(total number of genes) and 
(probability of mutation).
Then the probability that *at most* 4 genes get mutated is
where
You should find that
Then the probability that *at most* 4 genes get mutated is
where
You should find that