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Factorials' product (Posted on 2023-10-10) Difficulty: 2 of 5
Solve:

7!*6!=(x-5)!

Source: Pakistani Math Competition

No Solution Yet Submitted by Ady TZIDON    
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Solution Puzzle Solution | Comment 1 of 3
We know that:
7!*6!=10!
Then, we must have:
(x-5)! = 10!
=> x-5 =10
=> x = 15



  Posted by K Sengupta on 2023-10-10 06:56:17
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