No, basils answer was correct - (25 x 24 x 23)/ (3x2x1)

Which comes to 2300. No need for a calculator.

This assumes you aren’t allowed repeated numbers e.g. 7,7,7 is not allowed.

If you are allowed repeated numbers it is 25x25x25

(You have 25 choices each time)

If the order is important e.g. 7,8,9 is considered different to 7,9,8 then the answer is (25x24x23) = 13800

The reason for the dividing by 6 to get the actual answer of 2300 is that if you take the 13800 you have counted each triplet 6 times - e.g. for 7,8,9

7,8,9

7,9,8

8,9,7

8,7,9

9,7,8

9,8,7

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