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-- The first and last digits can be 1-3, 2-4, ... 6-8, 7-9. Seven (7) possibilities.

-- Or, they can be 9-7, 8-6 ... 3-1, 2-0. Eight (8) possibilities.

-- Fifteen (15) possible sets of first and last digits.

-- For each of those, the middle two digits can be anything from 00 to 99 ... 100 possibilities.

-- Total number of 4-digit numbers that meet these specs = 15 x 100 = 1,500 .

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