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199
995
101117
300
109999. (10000 + 99999)
900 It is the only three digit number with a nine in the numbers place
199
995
101117
99 + 9 = 108
300
198.
The smallest 5 digit integer is -99999. The largest 5 digit integer is 99999. The sum is therefore 0.
109999. (10000 + 99999)
105
269
The 3 largest 2 digit prime numbers are 83, 89, and 97. The sum is 269