Can you find out which number multiplied by itself will give the output as 12345678987654321?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

When it's bad luck to meet a black cat?

Which of the below owl is odd one out?

Can you count the number of triangles in the given figure?

The cream is heavier than Milk. True or False?

In the picture given below, can you find out which digit will take place of the question mark?