57.How many word can be formed by using all the letters of the word, 'ALLAHABAD' ?
A. 3780 B. 1890
C. 7560 D. 2520
Answer:
The word 'ALLAHABAD' contains 9 letters, namely 4A, 2L, 1H, 1B, and 1D.
Required number = 9! / (4!) (2!) (1!) (1!) (1!)
= 7560.
