How many landline telephone numbers are there with 7 digits such that: (c) the two initial digits are odd numbers and the remaining digits are different even numbers, d) the first and last digits are equal prime numbers, and the digit 7 occurs only onc

How many landline telephone numbers are there with 7 digits such that: (c) the two initial digits are odd numbers and the remaining digits are different even numbers, d) the first and last digits are equal prime numbers, and the digit 7 occurs only onc

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

3.51. How many landline telephone numbers are there with 7 digits such that:

(c) the two initial digits are odd numbers and the remaining digits are different even numbers,
d) the first and last digits are equal prime numbers, and the digit 7 occurs only once?

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