Student confuses a dilation (size change) with a translation (position change) when a figure is transformed.
Selected 6 times across all attempts
Student omits the 1/3 factor from the pyramid volume formula entirely.
Selected 4 times across all attempts
Student reasons that there are only two possible outcomes and a finite count is involved, confusing a binary categorical variable with a discrete numerical variable.
Selected 3 times across all attempts
Student stops one step too early, treating an intermediate result as the final answer.
Selected 2 times across all attempts