How many two digits numbers can be formed from the digits 2 4 6 if no digit is repeated in any number?

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There is no formula for this, here. Because you have specified the digits and a way to understand this intuitively is- $__ __ $ Suppose these dashes are the two digits.

So, in order for a number to be even, the last digit should be $0$ or $2,4,6,8$. So second digit can be $4$ or $6$ from your specified numbers. And the digit cannot be repeated, so there are $3+1=4$ digits left for the first place. So by multiplication principle, $$4\cdot 2=8$$ is the answer.

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