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A bag code has 2 colors and 1 shape. The colors are chosen in order from 5 colors without repetition. There are 4 shapes. If green is selected, the shape cannot be round. How many codes are possible?

Answer and explanation

Correct answer: 72

First count ordered color pairs. From 5 colors without repetition, there are 5×4 = 20 ordered pairs. Among these, the pairs containing green number 2×4 = 8: green may be first or second, and the other position has 4 choices. For each of these 8 pairs, the round shape is forbidden, leaving 3 shapes, so they contribute 8×3 = 24 codes. The remaining 20−8 = 12 color pairs do not contain green and allow all 4 shapes, contributing 12×4 = 48. Hence the total is 24+48 = 72, so option D is correct. Option C subtracts only one shape overall instead of once for every green-containing pair.

Related tags

PermutationsRestricted CountingFundamental Principle Of CountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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