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537??
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I am getting 540
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It is nothing but the number of Onto functions...
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edited by
Yes I did it in same way.

$3^{6}-3C1*2^{6}+3C2*1^{6} = 540$
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The correct answer would be:

36  -3C1(3-1)6 + 3C2(3-2)6 -3C3(3-3)6

540..

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Yes correct
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Please explain how did u get to that formula
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