Guess the number.
Number puzzles have specific set of rules, you first has to figure out the pattern being followed and then answer the puzzle according to the pattern.
Number puzzles are a part of many competitive examinations, these also helps you improve your logical thinking and above all these are fun to crack !!!
6 2 8
2 4 6
3 1 7
49 21 ?
Which number should replace the question mark?