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  1. A bag contains 3 red, 4 white and 7 black balls. The probability of drawing a red or a black ball, is
    1. 4/7
    2. 1/7
    3. 5/7
    4. 3/7
    5. None of the above
Correct Option: C

Here, total balls are 14.
∴ Required probability = (3c1 + 7c1) / 14c1
= (3 + 7)/14
= 10/14
= 5/7


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