PROBABLY THIS ONE !!! WHAT??/

Number Theory Level pending

From a bag containing 10 balls of which 4 are black , 5 balls are drawn and put into second box unnoticed. One ball is drawn from the second bag and is found to be white. What is the Probability that out of the drawn balls 2 were white. If it is of form \frac { a }{ b } . where " a" and "b" are co-primes. what is a+b ?

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