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How many ordered 2-digit codes can be formed from 6 distinct digits without repetition if the first digit cannot be 0?

Answer and explanation

Correct answer: 25

Use the multiplication principle while respecting both order and the restriction on the first position. Since the six distinct digits include 0, the first position cannot contain 0, so it has 5 choices. After selecting the first digit, one digit has been used; therefore the second position has 5 remaining choices, including 0 if it was not already selected. Repetition is not allowed, so the total is 5 × 5 = 25. Thus option B is correct. Option A incorrectly gives six choices for the second position, option C undercounts, and option D is 6 × 6, which permits repetition and also ignores the first-position restriction.

Related tags

PermutationsTwo-Digit CodeZero RestrictionPermutations And CombinationsMathematicsClass 11 Mcq

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