“The Ten Commandments should be treated like an examination. Only six need to be attempted.” So said Bertrand Russell, allegedly.

“I have a variant,” wrote J.E. Littlewood. “As a Pure mathematician I can’t be expected to do the Applied ones. Interpreting No. 1 to mean what it says in logic, I should be prepared to do the Pure ones. No. 2 is a sitter, No. 3 would take some initial caution, but worth it with the reward of full marks. It is good mental hygiene to take Sunday off, and I could throw in this Applied question. Nos. 5 to 10 are applied. Actually my parents are dead so No. 6 is a walk-over. And I should be disappointed if I didn’t get full marks on the applied 9 and 10.”