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
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.2: Arithmetic Sequences
Problem 54E
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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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