For any particular trial, the total probability is 1.
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Probability of getting a head or tail is not equal
It is the probability of an event that will definitely happen.
The probability of picking white is equal to the number of white objects divided by the total number of objects (both white and non-white), assuming that all of the objects are identical other than color. In Geometry, the probability of landing on a white space is the area of the white space divided by the total area.
To get the EXPERIMENTAL probability, you'll have to actually carry out the experiment. The EXPECTED probability is equal to a fraction; the numerator will be the number of pieces of papers that have the number 35, the denominator will be the total number of pieces. If you repeat the experiment often, you can expect the experimental probability to be close to the expected probability.
The sum of the probability of success and the probability of failure had better equal 1.00 (100%) or an error has been committed.