10 ba ll s . B ec a u se : T h e f i rs t f i v e ba ll s d r a w n c an b e b l a c k . T h e n e x t f o u r ba ll s c an b e b l u e ( 5 + 4 = 9 ) . E v ery n e x t ba ll i s re d .
To ensure you have at least one ball of each color, you need to draw a minimum of 10 balls. This covers the scenario where you might first draw all 5 black balls and all 4 blue balls. The final draw will guarantee a red ball.
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