Track / Stage 4 / 10 of 340 #270 of 1964

5. What is the value of $201 \times 7-7 \times 102$ ?
A 142800
B 793
C 693
D 607
E 0

This one wants a proof. Work it on paper, then read the official solution and mark yourself. Be honest about it: the record is only any use to you if it is.

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Official solution

None

Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic, difficulty and ordering added by this site.