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Factorials' product (
Posted on 2023-10-10
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Solve:
7!*6!=(x-5)!
Source: Pakistani Math Competition
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Submitted by
Ady TZIDON
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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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