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If the number of ways in which 7 letters can be put in 7 envelopes such that exactly four letters are in wrong envelopes is N, thenA. Number of divisors of N is 12B. Sum of proper divisors of N is 624C. Number of divisors of N which are divisible by 3 but not by 9 is 4D. Sum of proper divisors of N is 309 |
| Answer» Correct Answer - A | |