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JEE Advanced 2014 Paper 2
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Question : 43
Total: 60
Six cards and six envelopes are numbered 1, 2, 3, 4, 5, 6 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 more over the card numbered 1 is always placed in envelope numbered 2. Then the number of ways it can be done is
[JEE Adv 2014 P2]
264
265
53
67
Validate
Solution:
Number of required ways = 5! - {4 . 4! -
‌
4
C
‌
2
. 3! +
‌
4
C
‌
3
.2! - 1} = 53
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