Niles Brisbane
1. This is just simple counting.
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2. Keys beginning with a consonant: 3, 4, 5, 6, 7, 8, 9—a total of 7.
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3. Keys ending with a consonant: 2, 3, 5, 7, 8, 9—a total of 6.
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4. Keys with more than two consonants: 5, 7, 9—a total of 3.
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5. Keys with less than three consonants: 1, 2, 3, 4, 6, 8. But wait. Is that all?
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6. Even though you're looking at letters, don't forget that there are more keys to the keypad.
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7. How about *, 0 and #? They're still keys, and they have less than three consonants, don't they? That brings the total up to 9.
(SOLUTION FOLLOWS)
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8. Type 7639.