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Maths-

General

Easy

Question

Let m denote the number of four digit numbers such that the left most digit is odd, the second digit is even and all four digits are different and n denotes the number of four digit numbers such that the left most digit is even, an odd second digit and all four different digits. If m = nk then the value of k equals

$\frac{6}{5}$
$\frac{5}{4}$
$\frac{4}{3}$
$\frac{3}{2}$

The correct answer is: $fraction numerator 5 over denominator 4 end fraction$

m = 5.5.8.7
= 1400
n = 1400 - (587)
= 1400- 280 = 1120
$k equals fraction numerator 1400 over denominator 1120 end fraction equals fraction numerator 5 over denominator 4 end fraction$

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