Find the next number in the sequence

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

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Can it be possible to build a house that has all its four walls facing towards the South?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Find the last number in the series below:

voN luJ yaM raM ---

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?