For a fishing trip, Dante is going to choose lures to put in his tackle box. He has 10 lures that are jigs and 8 that are crankbaits. In how many ways can he choose 9 lures if 2 or fewer must be crankbaits?

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Q: w that msn. Show that E X₁ X1 + X₂ = E X₂ X1 + X₂ X₁+...+Xm m

A: