Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

By moving just one matchstick, you need to make the below statement true. Can you do it?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

How can you make number one disappear by adding something to it?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

If an electric train is travelling south, then which way is the smoke going?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.