Let 'm' denotes the number of four digit numbers such that the left most digit is odd

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

Let 'm' denotes 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 left most digit is even, second digit is odd and all four digits are different. If m=nkm = nk , then k equals : (a) 45\frac{4}{5} (b) 34\frac{3}{4} (c) 54\frac{5}{4} (d) 43\frac{4}{3}

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