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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   
Find a set of 8 points with no three collinear such that no subset of 5 forms a convex pentagon.
(Solution Posted, 4 Comments) Submitted on 2009-10-09 by Jer   
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)

Recently Posted Solutions:
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Submitted By K Sengupta. Solution posted on 2024-05-29 00:58:41
Difficulty: 3 of 5Greatest Root Power (in Just Math)
Submitted By K Sengupta. Solution posted on 2024-05-28 23:48:31
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Difficulty: 3 of 5Musicians (in Logic)
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