Find the next number in the sequence

1, 2, 6, 21, 88, __?

Count the number of triangles in the below picture?

What breaks yet never falls, and what falls yet never breaks?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

I am lying and I always lie. Tell me whether I am lying or telling the truth.

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

Complete the table series riddle by finding the number that can replace "??".

A man is found unconscious in front of a store at two in the morning. His head is bleeding and there’s a brick laying next to him. When the police arrive, they carry the man to jail. Why did they arrest him?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Can anyone tell me a word in the English dictionary which has a silent 'z'?