I asked the first question - whether gambling is a sin.

this is the final question- is who wants to be a millionaire sin?

it is a gamble too.

It involves chance, luck and high stakes.
And winning depends on another losing (either the participant or the host).

so is this t.v game sin?

Thanks for the question.
It's not a sin! The reason is that
You have read and you want to convert your knowledge into fortune, then you pay the price to get to the stage. You dispense whatever you know just like an exam. That's all
The game is even educative.