Amit must choose a seven-digit PIN number and each digit can be chosen from 0 to 9. How many different possible PIN numbers can Amit choose?(a) 10000000(b) 9900000(c) 67285000(d) 39654900This question was addressed to me during a job interview.This interesting question is from Fundamental Principle of Counting topic in portion Counting of Discrete Mathematics

Amit must choose a seven-digit PIN number and each digit can be chosen

1.	Amit must choose a seven-digit PIN number and each digit can be chosen from 0 to 9. How many different possible PIN numbers can Amit choose?(a) 10000000(b) 9900000(c) 67285000(d) 39654900This question was addressed to me during a job interview.This interesting question is from Fundamental Principle of Counting topic in portion Counting of Discrete Mathematics
Answer» The correct answer is (a) 10000000 Best explanation: By the BASIC COUNTING principle, the TOTAL NUMBER of PIN numbers Amit can choose is 10 × 10 × 10 × 10 × 10 × 10 × 10 = 10,000000.

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