Math, asked by 4givEN, 8 months ago

1. How many four-digit numbers can be formed from the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 if

a. Repetition is not allowed

b. Repetition is allowed

Answers

Answered by sunilkumari1986sang

0

Answer:

b. repetition is allowed: 9999 on

Step-by-step explanation:

a. repetition is not allowed : 9876

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