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How many six-digit telephone numbers can be formed if the first two digits are 45 and no digit can appear more than once? - Mathematics and Statistics

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Sum

How many six-digit telephone numbers can be formed if the first two digits are 45 and no digit can appear more than once?

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Solution

Let the telephone number be 45 abcd

  Number of ways to fill
a 8
b 7
c 6
d 5

Required number = 8P4 = 1680

Concept: Permutations
  Is there an error in this question or solution?
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APPEARS IN

Balbharati Mathematics and Statistics 2 (Commerce) 11th Standard HSC Maharashtra State Board
Chapter 6 Permutations and Combinations
Miscellaneous Exercise 6 | Q 16 | Page 93
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