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Puzzle 1:- What number should replace the question mark?

Numbering Puzzle
Ans:-0.
Sol:-Looking at lines of numbers from the top : 9×8 = 72; 72×8 = 576; 576×8 = 4608.

Puzzle 2:- What number should replace the question mark?

Numbering Puzzle
Ans:-17.
Sol:-It is the sum of the two digits(9 + 8) in the quadrant opposite.

Puzzle 3:- What number should replace the question mark?

Numbering Puzzle
Ans:-55.

Sol:-Each number indicates its position in the grid.55 indicates row 5 columns 5.

Puzzle 4:- What number should replace the question mark?

Numbering Puzzle
Ans:-19.

Sol:-As you move diagonally down, numbers follow the sequence of Prime Numbers.

Puzzle 5:- What number should replace the question mark?

Numbering Puzzle
Ans:-16.

Sol:-Starting bottom left and moving clockwise around the triangle, numbers follow the sequence of Square Numbers.