Question

probobiilty of getting atleast one head.
2, A bog contains 14 balls of which Xove cob
1+ 6 more cohle balls one added to the bag
the probability of drawing cobite is Y
And the value of x.
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Answer 1

Answer:

Total no. of balls =14

There are only 2 colours of balls i.e, let them be white and black respectively.

There are 7 white and 7 black colour balls.

P( getting at least 3 balls ).

At least 3 balls means the no. of balls can be 3,4,5,6 and 7.

If 3 white turns up the no. of black balls will be 4 and vice versa.

∴ Probability of selecting a ball =

2

1

P( Selecting 7 balls ) =

2

7

∴ P( getting at least 3 balls ) =

7

2

7

=

2

1

Hence, the answer is

2

1

.