There are 428 pages, starting with 1. So we have the set 1,2,3,...,427,428.
The set of even numbers is 2,4,6,...,426,428 which represents half of the previous set mentioned. It might help to look at a smaller set like {1,2,3,4} and note that the evens make up half of this and the odds make up the other half.
So the probability of landing on an even page is 1/2 = 0.5; multiply that with the number of experiments done to get (1/2)*50 = 25 which is the number of times we expect to land on an even-numbered page.
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Step-by-step explanation: PEMDAS use this ok first you do 7x7 to equal 49 then add 50 to equal 99. then do 5x5x5 to equal 125. the parentheses are gone and the 5x5x5 is gone now the problem is 125-2x3-99. to finish you multiply 2x3 to equal 6 now 125-6-99=20 answer-20
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