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Question
A bag contains 9 balls marked with the digits 1,2,3.....9. If two balls are drawn from the bag then find the number of ways of getting the sum of digits on the balls as odd?
A bag contains 9 balls marked with the digits 1,2,3.....9. If two balls are drawn from the bag then find the number of ways of getting the sum of digits on the balls as odd?
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Solution
The correct option is A 4 C1×5 C1
we have set of balls marked 1, 2, 3, 4, 5, 6, 7, 8, 9 on them.
Number of balls marked with odd digits = 5
Number of balls marked with even digits = 4
to make sum of digit odd we need to select one even and one odd number
combination-4C1×5C1
option (a) is correct
we have set of balls marked 1, 2, 3, 4, 5, 6, 7, 8, 9 on them.
Number of balls marked with odd digits = 5
Number of balls marked with even digits = 4
to make sum of digit odd we need to select one even and one odd number
combination-4C1×5C1
option (a) is correct