Question

How many 6's are there in the following sequence, which are either immediately preceded by 2 or immediately followed by 9?
5 6 2 4 3 6 9 2 6 7 1 6 4 7 6 8 2 6 3 4 6 9 8 6 2

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

Answer: (D)

$4$

In the given series we look for pattern of the form

26 or 69

$56243\underset{–}{69}\underset{–}{26}7164768\underset{–}{26}34\underset{–}{69}862$
4 such occurrences.
Option D is answer.