Can you place six X (crosses) in below board without making three in a row in any way ?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Find the missing number in the image below.

How many times in a given day, minutes and hour clock comes in a straight line ?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

Why is Saturday stronger than Monday?

Which digit occurred maximum times between the number 1 and 1000?