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GATE-Agricultural-Engineering-2018-->View question

## In a box, there are 2 red, 3 black and 4 blue coloured balls. The probability of drawing 2 blue balls in sequence without replacing, and then drawing 1 black ball from this box is _________%. (GATE-Agricultural-Engineering-2018)

##### In a box, there are 2 red, 3 black and 4 blue coloured balls. The probability of drawing 2blue balls in sequence without replacing, and then drawing 1 black ball from this box is_________%. (GATE-Agricultural-Engineering-2018)

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There are two approachesfor solving the problem  :-
Non combination approach
Combination Approach.
The probability of drawing 2 blue balls in sequence without replacing, and then drawing 1 black ball from this box is 2/7.

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