1, 4, 9, 16, ?, 36. What number should fill the blank?
Category: Math · Difficulty: expert
Hint: Think about perfect squares.
Answer
25
Explanation
The sequence consists of the squares of the integers: 1², 2², 3², 4², 5², 6². Therefore, the missing number is 5² = 25.
This is a expert math riddle — one of the harder riddles here. The answer is 25.
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