First, each day the probability of getting the number you selected at least once is 1 - (35/36)50 . Call that probability p.
Then the probability density function of that outcome in 260 trials is the binomial distribution with parameters 260 and p.
The expectation from that distribution is 260p. I will leave the arithmetic to you.

Paul M.
tutor
You need a scientific calculator.
(35/36)^50 is approximately.25 & I think you should be able to do the subtraction and the multiplication to get the expected # of 196.
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05/05/18
Dylan R.
05/05/18