Multiplication in a minute.
Number Theory
Level
pending
Do this: (19971997)(1998)-(19981997)(1997)
The answer is 1997.
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1 solution
19971997 * 1998 - 19981997 * 1997 = 19971997 * 1998 - 19981998 * 1997 + 1997 = 1997 * 10001 * 1998 - 1998 * 10001 * 1997 + 1997 = 1997