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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.

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

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