An n digit positive number with exactly n digits. Nine hundred distinct n-digit numbers are to be formed using only the three digits 2, 5 and 7.

Question 1

An n digit positive number with exactly n digits. Nine hundred distinct n-digit numbers are to be formed using only the three digits 2, 5 and 7. The smallest value of n for which this is possible, is

(a) 6

(b) 7

(c) 8

(d) 9

Question 2

The correct option is (b) 7

Explanation:

Distinct n digit numbers which can be formed using digits 2,5 and 7 are 3n. We have to find n so that

kratos · Answer 1 · 2020-01-15T16:46:56+0000

The correct option is (b) 7

Explanation:

Distinct n digit numbers which can be formed using digits 2,5 and 7 are 3n. We have to find n so that

An n digit positive number with exactly n digits. Nine hundred distinct n-digit numbers are to be formed using only the three digits 2, 5 and 7.

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An n digit positive number with exactly n digits. Nine hundred distinct n-digit numbers are to be formed using only the three digits 2, 5 and 7.

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1 Answer

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