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The total number of balls in the bag $$= 3 + 4 + 1 = 8$$ balls

So, the number of possible outcomes $$= 8 = n(S)$$

Event of drawing a red ball $$= {R, R, R}$$

So, $$n(E) = 3$$

Thus, probability of drawing a red ball $$= n(E)/ n(S) = 3/8$$

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