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Factorials' product (Posted on 2023-10-10)

Solve:

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

Source: Pakistani Math Competition

No Solution Yet 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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