Question

In the given series
$2,5,3,6,8,4,9,6,8,1,5,1,6,8,7,5,6,2,7,5,3,6,8,3,7,6,8,1,5,6,8$
How many times the number '$6$' is followed by the number '$8$' but '$8$' should not be followed by '$1$'?

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is D $4$

$2,5,3,(6,8),4,9,6,8,1,5,1,(6,8),7,5,6,2,7,5,3,(6,8),3,7,6,8,1,5,(6,8)$
Four times when ${}^{\prime }{6}^{\prime }$ is followed by the number ${}^{\prime }{8}^{\prime }$ but ${}^{\prime }{8}^{\prime }$ is not be followed by ${}^{\prime }{1}^{\prime }.$