Let S={1,2,3,4,5,6,7,8,9}. Let x be the number of 9-digit numbers… | JEE Main 2026 Mathematics PYQ

MCQMediumJEE Main 2026 · 28 January, Shift 1Applications of P&C

Let $S=\{1,2,3,4,5,6,7,8,9\}$ . Let $x$ be the number of $9$ -digit numbers formed using the digits of the set $S$ such that only one digit is repeated and it is repeated exactly twice. Let $y$ be the number of $9$ -digit numbers formed using the digits of the set $S$ such that only two digits are repeated and each of these is repeated exactly twice. Then:

A
$21x=4y$
B
$45x=7y$
C
$56x=9y$
D
$29x=5y$

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