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Six cards and six envelopes are numbered math xmlns=http://www.w3.org/1998/Math/MathMLmn1/mnmo,/momo /momn2/mnmo,/momo /momn3/mnmo,/momo /momn4/mnmo,/momo /momn5/mnmo,/momo /momn6/mn/math and cards are to be placed in envelopes so that each envelope contains exactly one card and no card is placed in the envelope bearing the same number and moreover the card numbered math xmlns=http://www.w3.org/1998/Math/MathMLmn1/mn/math is always placed in envelope numbered math xmlns=http://www.w3.org/1998/Math/MathMLmn2/mn/math. Then the number of ways it can be done is:
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