Math Genius: Problem calculating probabilities in Risk

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This comes from this website:
Its about calculating probabilities of the game Risk.

probability of throwing N as the “highest” dice with two dice must be the
probability of throwing “N or less” MINUS the probability of throwing
“N-1 or less” with two dice.

i don’t understand why its P(“N or less”) – P(“N-1 or less” with 2 dice).
Is there a law of probability that can explain this?

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