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Number Puzzles Questions and Answers

Puzzles
37. What number should replace the question mark?
Ans: 12.
Sol.
Looking across and down, in each line of four numbers the sum of the first two numbers is one less than the sum of the second two numbers.
 
38. Which number is the odd one out?
Ans: 3826.
Sol.
The rest are in anagram pairs, i.e.8674/6847, 2493/3429, 1376/7163, 2197/1927
 
39. What two terms complete this series?
Ans: S 19
Sol.
There are two separate series. The letters advance missing first two (A to D). then three (D to H) and so on. After M there must be five missing letters, bringing us to S. The numbers advance in the same way.