The following items are allowed as airline carry-on items: (1) safety razors, (2) eyedrops and saline, (3)

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The following items are allowed as airline carry-on items: (1) safety razors, (2) eyedrops and saline, (3) nail clippers and tweezers, (4) blunttipped scissors, (5) mobile phones, (6) umbrellas, (7) common lighters, (8) beverages purchased after security screening, and (9) musical instruments. Suppose that your airline allows only 6 of these items. In how many ways can you pick 3 not to take?

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