IPM Question Paper 2020 | IPM Rohtak Quantitative Aptitude

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Question 12 : A box contains 2 white shirts, 3 black shirts, and 4 red shirts. In how many ways can 3 shirts be drawn from the box, if at least one black shirt is to be included in the draw?

1. 60
2. 40
3. 64
4. 82

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Video Explanation

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Explanatory Answer

Two White Shirts - W1, W2
3 Black Shirts - B1, B2, B3
4 red Shirts - R1, R2, R3, R4

At least 1 black shirts - We cannot have 0 black shirts

When 1 Black Shirt is selected.

BLACK	WHITE	RED	TOTAL
1 (3 ways)	0 (1 way)	2 (4C2) = 6 ways	3 × 1 × 6 = 18 ways
1 (3 ways)	2 (1 way)	0	3 × 1 = 3 ways
1 (3 ways)	1 (2 ways)	1(4 ways)	3 × 2 × 4 = 24 ways
Total			45 ways

When 2 Black Shirts are selected.

BLACK	WHITE	RED	TOTAL
2 (3C2) = 3 ways	1 (2C1) = 2 ways	0	3 × 2 = 6 ways
2 (3C2) = 3 ways	0	1 (4C1) = 4 ways	3 × 4 = 12 ways
Total			18 ways

When 3 Black Shirts are selected.

BLACK	WHITE	RED	TOTAL
3 (3C3) = 1 way	0	0	1 way
Total			1 way

So, Total number of ways
When 1 Black Shirt = 45 ways
When 2 Black Shirts = 18 ways
When 3 Black Shirts = 1 way

Total = 64 ways

The question is " A box contains 2 white shirts, 3 black shirts, and 4 red shirts. In how many ways can 3 shirts be drawn from the box, if at least one black shirt is to be included in the draw? "

Hence, the answer is 64

Choice C is the correct answer.

 

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