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Probability

Short Answer Type

151. Cards bearing numbers 3 to 20 are placed in a bag and mixed thoroughly. A card is taken out from the bag at random. What is the probability that the number on the card taken out is an even number.

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152. A die is thrown once. Find the probablity of setting ‘a’ prime number.

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153. A die is thrown once. Find the probability of gettings ‘a number divisible by 2.’

If a die is thrown once, then S = {1,2,3,4,5,6} i.e. n( s) = 6
Let A be the favourable outcomes of setting number divisible by 2. then
A = {2,4,5} i.e. n(A) = 3

Therefore, P(A) = $fraction numerator straight n left parenthesis straight A right parenthesis over denominator straight n left parenthesis straight S right parenthesis end fraction equals 3 over 6 equals 1 half.$