Multiple choice general knowledge math & puzzles complete the following series. B,C,E,G,K,M,_. Q W S R Reveal answer Fill a bubble to check yourself A Correct answer Explanation The pattern follows prime number positions in the alphabet: B(2), C(3), E(5), G(7), K(11), M(13), Q(17). Each letter's position is a prime number. Option A (Q=17) fits, while W(23), S(19), and R(18) don't maintain the sequential prime pattern.