how many 4-letter code can be formed using the first 10-letters of the english alphabet,if no letter can be repeated?

explain with reason

First Ten Letters Of Alphabet

that is A, B, C, D, E, F, G, H, I, J.

Condition is that no letter can repeated

Method 1:

10x9x8x7=5040

Method 2:

¹⁰P₄ = 5040

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