What does this rebus riddle means ?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

what one word does the below rebus identifies?

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

What does it mean?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?