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Welcome to perplexus.info, flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems!
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Difficulty: 3 of 5 Latest: Factorials (in Numbers)
What decimal digit occurs most often in the sequence of factorials from 77777! to 77877! inclusive?

This can be solved by logic. You do not need to compute any factorials.

(No Solution Yet, 0 Comments) Submitted on 2024-05-29 by K Sengupta   
Difficulty: 2 of 5 Bonus: Ages and ages (in Numbers) Rating: 3.67
A Father, son and grandson are walking in the park. A man approaches them and asks for their age. The Father replies, "My son is as many weeks as my grandson is in days, and my grandson is as many months old as I am in years. We are all 100 years together."

How old were each?

(Solution Posted, 8 Comments) Submitted on 2003-11-04 by Popstar Dave   
Difficulty: 3 of 5Repeating Digits (in Numbers) Rating: 5.00
Posted on 2024-05-28 by K Sengupta (Solution Posted, 2 Comments)
Difficulty: 3 of 5Internal Division Angles (in Geometry)
Posted on 2024-05-28 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5The Shipwreck (in Logic)
Posted on 2024-05-28 by K Sengupta (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Binary Decimal (in Numbers) Rating: 5.00
Posted on 2024-05-27 by K Sengupta (Solution Posted, 1 Comments)
Difficulty: 3 of 5Product in calendar (in Just Math) Rating: 4.00
Posted on 2024-05-27 by Jer (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Geometric Configuration in a Regular Hexagon (in Geometry)
Posted on 2024-05-26 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 3 of 56 Squares (in Numbers) Rating: 5.00
Posted on 2024-05-26 by K Sengupta (Solution Posted, 1 Comments)
Difficulty: 3 of 5Inscribed Angles in a Circumscribed Pentagon (in Geometry)
Posted on 2024-05-25 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 549 Cups (in General) Rating: 5.00
Posted on 2024-05-25 by K Sengupta (Solution Posted, 3 Comments)
Difficulty: 3 of 5Given the Expression, Find the Function (in Calculus) Rating: 5.00
Posted on 2024-05-24 by K Sengupta (Solution Posted, 3 Comments)
Difficulty: 3 of 5LucĂ­a's Odd Product (in Numbers)
Posted on 2024-05-24 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Numbers and their inversions (in Numbers) Rating: 5.00
Posted on 2024-05-23 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 3 of 5An Infinite Lattice of Points (in Probability) Rating: 5.00
Posted on 2024-05-23 by K Sengupta (Solution Posted, 2 Comments)
Difficulty: 3 of 5Skating Dynamics (in Just Math)
Posted on 2024-05-23 by Danish Ahmed Khan (No Solution Yet, 3 Comments)

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