In a marketing survey consumers are asked to give their firs

In a marketing survey consumers are asked to give their first three choices, in order of preference of 7 different drinks. In how any different ways can they indicate their choices?

Solution

In a marketing survey consumers are asked to give their first three choices, in order of preference of 7 different drinks. In how any different ways can they indicate their choices?

their first three choices are = ⁷C₁*⁶C₁*⁵C₁ = 7*6*5 = 210