Multiple choice

Directions: Choose the correct option to fill in the blanks.

Number theory is rich in problems of an especially _________ sort: they are tantalisingly simple to state but ____________ difficult to solve.

  1. cryptic, deceptively

  2. spurious, equally

  3. abstruse, ostensibly

  4. elegant, rarely

  5. vexing, notoriously
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Vexing means distressing or annoying, and notorious - unfavourably known - as difficult to solve.

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