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The number of natural numbers less than 7,000 which can be formed by using the digits 0,1,3,7,9 (repetition of digits allowed) is equal to:



Question ID - 56769 | SaraNextGen Top Answer

The number of natural numbers less than 7,000 which can be formed by using the digits 0,1,3,7,9 (repetition of digits allowed) is equal to:

1 Answer
127 votes
Answer Key / Explanation : (374) -

 a1

a2

a3

 Number of numbers=53−1

a4

a1

a2

a3

2 ways for a4

Number of numbers=2 53

Required number=53+2 53−1

=374

127 votes


127