Opening the paper…

Statistics for Data Science I, Quiz 2

September 2021 term, 31 Oct 2021, Set QPA

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Figure from the original question paper Figure from the original question paper In a box, there are 21 consecutively numbered tickets. In how many ways, three tickets can be drawn at random such that the numbers on these tickets are in arithmetic progression(A.P.)? (Note: An arithmetic progression is a sequence where the differences between every two consecutive terms are the same)\ **NOTE:** Enter the answer to the next smallest integer.