Question

$7,8,9,7,6,5,3,4,2,8,9,7,2,4,5,9,2,9,7,6,4,7$
What is the difference of the numbers of $7$ preceded by $9$ and followed by $6$ and the number of $5$’s
followed by $3$ ?

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is A $1$

$7,8,9,\underset{–}{7},6,\underset{–}{5},3,4,2,8,9,7,2,4,5,9,2,9,\underset{–}{7},6,4,7$

$7$ preceded by $9=7$ that comes after $9$

$7$ followed by $6=7$ that comes before $6$

$\therefore$ Number of 7's that comes after $9$ and before $6=2$

$5$ followed by $3=5$ that comes before $3$

$\therefore$ Number of 5's that comes before $3=1$

Difference of number of $7s$ and $5s=2-1$

$=1$

$\therefore$ The correct option is (A) $1$.