Asked by Eve
Hi. I know there must be a formula for this question, but I just can't figure it out.
Q.) Imagine a large multiple choice sheet printed with response spaces like the sample below. Now how many unique responses can be encoded? Explain your reasoning!
(A)(B)(C)(D)(E)(F)(G)(H)(I)
Q.) Imagine a large multiple choice sheet printed with response spaces like the sample below. Now how many unique responses can be encoded? Explain your reasoning!
(A)(B)(C)(D)(E)(F)(G)(H)(I)
Answers
Answered by
bobpursley
well, you can have 9 single answers
and 9*8 double answers
and 9*8*7 triple answers and so on.
It looks as if the sum must be
Sum(9-n)!/(n)! from n=0 to 8
check that.
and 9*8 double answers
and 9*8*7 triple answers and so on.
It looks as if the sum must be
Sum(9-n)!/(n)! from n=0 to 8
check that.
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