Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

I can be cracked, made, told, and played. What am I?

What makes this number unique: 8,549,176,320?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

What has 88 keys?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

There is an exact a week gap between Christmas and New Year. Hence, It is obvious that the new year that comes right after Christmas comes on the same day of the week.

A Strange thing happened in the Year 1777. Christmas occurs on Wednesday and New Year on Monday. How is that possible?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

Prove that twice of ten is the same as twice of eleven.

What is black when you buy it, red when you use it, and gray when you throw it away?