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There are twelve instances where the integers from 1 to 200 contain the digit 1 at least twice:-11,101,110,111,121,131,141,151,161,171,181,191.
"MMVII" is the year 2007, represented as a Roman numeral. (M= 1000, twice, V=5, I=1, twice. 1000+1000+5+1+1 = 2007.)
1 + 2n
1 - 2n
842