Hard
One year in the nineteenth century, the mathematician De Morgan remarked, 'my age now is the square root of this year'. When was De Morgan born?
Explanation
Explanation
Per the official answer key the marked answer is 'C' (1849). Note: 1849 is the year De Morgan made the remark (43 squared = 1849, so his age was 43 that year); his actual birth year, historically, is 1806 (option B) - 1849 minus 43. Treat this one with some caution given the apparent mismatch with the question's wording.
PRO TIP
Re-check your working by substituting the answer back into the original question.