Mathematics - Permutation & Combination Question with Solution | TestHub

MathematicsPermutation & CombinationnPr & nCrMedium2 minPYQ_2019

MathematicsMediumsingle choice

The number of natural numbers less than $7000$ which can be formed by using the digits $0, 1, 3, 7, 9$ (repetition of digits allowed) is equal to:

Answer:

Solution:

$∴$ Total number formed less than

$7000 = 3 \times 5 \times 5 \times 5 = 375$

$∴$ Total natural number formed less than

$7000 = 375 - 1 = 374$

(number zero has been excluded)

Stream:JEESubject:MathematicsTopic:Permutation & CombinationSubtopic:nPr & nCr

⏱ 2mℹ️ Source: PYQ_2019

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