Are there situations in which we add subtract or multiply the obtained probability . For eg in a die the chance of getting no:2 is1/6 therefore the chance of getting 2or 4 is 1/6+1/6=2/6 . Is this correct mam if so are there other examples .

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Solution

yes you are right.
when a dice is thrown we get the following out comes

S = { 1,2,3,4,5,6}

n(S) = 6

probability of getting 3 is 1/6 [as there is only one 3]

probability of getting 4 is 1/6 [ there is only one 4]

Using addition theorem of of probability ,

probability of getting 3 or 4 is 1/6 + 1/6 = 2/6 = 1/3

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