Use the multiplication principle to solve the problem.
-How many different 7 -digit phone numbers are possible if the first digit cannot be a 0 ?
A) $1,000,000$
B) $10,000,000$
C) $9,000,000$
D) 900,000

Question

Quizplus · Accepted Answer

The first digit has 9 possible choices (1-9), and each of the remaining 6 digits has 10 possible choices (0-9). Therefore, the total number of different phone numbers is $9 \times 10^6 = 9,000,000$.

Use the Multiplication Principle to Solve the Problem 1,000,0001,000,0001,000,000 B) 10,000,00010,000,00010,000,000 C) 9,000,0009,000,0009,000,000

Use the Multiplication Principle to Solve the Problem $1,000,000$ B) $10,000,000$ C) $9,000,000$