Complete the table series riddle by finding the number that can replace "??".

Decode below rebus
D
N
A
T
S , D

What number when divided in half becomes zero?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

Solve below popular number sequence
314 159 265 358 979 323 846 ?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C