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Re: At a college, 100 seniors play any of the three games ... [#permalink]
Why 2*10 for (A∩B∩C)
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Re: At a college, 100 seniors play any of the three games ... [#permalink]
35 Don't use brain bros
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At a college, 100 seniors play any of the three games ... [#permalink]
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sanketthosani wrote:
Why 2*10 for (A∩B∩C)


Refer to the figure Below:

L refers to leftovers i.e. Not participating in any group

S = a + d + x + f
B = b + e + x + d
H = c + e + x + f

S + B + H = a + b + c + 2e + 2d + 3x


We know,
Total - L = a + b + c + d + e + f + x

Now, if we write Total - L = A + B + C - d - e - f = a + b + c + 2e + 2d + 3x - d - e - f = a + b + c + d + e + f + 3x
We need to subtract 2x from it in order to get the correct form.

Hence, we subrtract 2x.
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