Think of this puzzle What do you need to find a chosen number from this square? Four of the clues below are true but do nothing to help in finding the number. Four of the clues are necessary for finding it.
Here are eight clues to use:
a. The number is greater than 9.
b. The number is not a multiple of 10.
c. The number is a multiple of 7.
d. The number is odd.
e. The number is not a multiple of 11.
f. The number is less than 200.
g. Its ones digit is larger than its tens digit.
h. Its tens digit is odd.
What is the number?
Can you sort out the four clues that help and the four clues that do not help in finding it?
First follow the clues and strike off the number which comes out from it. Like - from the first clue we come to know that the number is not from 1 to 9. (strike off numbers from 1 to 9).
After completing the puzzle, see which clue is important and which is not?