The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Give it food and it will live; give it water and it will die.

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

What can you see in the middle of March and April that you can never see in any other month?

When can we add 2 to 11 and get 1 as the correct answer?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.