m−310n
11m10n
m+110n
11m+410n
Correct answer is B
mn+(m−1)5n−(m−2)10n; 10m+2(m−1)−1(m−2)10m
= 10m+2m−2−m+210n
= 10m+2m−m−2+210n
= 11m10n
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