Mathematics - Permutation & Combination Question with Solution | TestHub

MathematicsPermutation & CombinationFundamental PrincipleMedium2 minQB

MathematicsMediumsingle choice

Let N be the number of 7-digit numbers the sum of whose digits is even. The number of +ve divisors of N is

Answer:

Solution:

$N = \frac{9 \times 1 0 ^{6}}{2} = 2^{5} . 3^{2} . 5^{6}$

No of divisions N is $6 \times 3 \times 7 = 126$

Stream:JEESubject:MathematicsTopic:Permutation & CombinationSubtopic:Fundamental Principle

⏱ 2mℹ️ Source: QB

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