Challenger App

Refer to the following number series and answer the question that follows (all numbers are single-digit numbers only and counting to be done from left to right only).

(Left) 6 7 6 5 2 2 7 3 1 2 8 8 1 2 7 6 8 9 7 1 4 8 2 (Right)

How many such even digits are there, each of which is immediately preceded by an even digit and also immediately followed by an even digit?

Refer to the given number series and answer the question that follows. Counting to be done from left to right only.

(Left) 4 3 5 6 2 1 5 5 7 1 5 2 3 6 9 7 4 7 9 5 8 5 3 7 4 2 1 (Right) .

How many such odd digits are there each of which is immediately preceded by an even digit and also immediately followed by an even digit?

Each of the digits in the number 318924765 is arranged in descending order from left to right. The position of how many digits will remain unchanged as compared to that in the original number?