The value of $$1 + 21 + 4161 + 81 - 11 - 31 - 51 - 71 - 91$$ is

Solution

Pairing each subtracted term with the addition ten more than it gives $$1 - 11 = -10$$, $$21 - 31 = -10$$, $$41 - 51 = -10$$, $$61 - 71 = -10$$ and $$81 - 91 = -10$$. Adding these five results gives $$-50$$.

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