A box contains 20 tickets of identical appearance, the tickets being numbered 1,

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โœช Choose the correct option.

A box contains 20 tickets of identical appearance, the tickets being numbered 1, 2, 3, ….., 20. In how many ways can 3 tickets be chosen such that the numbers on the drawn tickets are in arithmetic progression ?

A. 18
B. 33
C. 56
D. 90

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