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

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

What occurs twice in a week, once in a year but never in a day?

There is something which you can be arrested for attempting but not for successfully completing.

What type of tree can I carry in my hand?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

What begins with T, ends with T, and has T in it?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?