A bag contains 9 balls marked with digits
1, 2, ...., 9. If two balls are drawn from the bag,
then number of ways of getting the sum of the
digits on balls as odd number is-
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The Balls are marked as 1,2,3,4,5,6,7,8,9 and the sum can be odd numbers when the balls are 1+2, 1+4, 1+6, 1+8, 2+3, 2+5, 2+7, 2+9, 3+4, 3+6, 3+8, 4+5, 4+7, 4+9, 5+6, 5+8, 6+7, 6+9, 7+8 and 8+9.
The total number of outcomes is= 9*9= 81
P(Sum is odd)= 20/81
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