In the series W 3 K $ B 8 N T 5 ? R 2 * 9 G 6 # V, which element lies exactly midway between K and R?

K stands at place 3 and R at place 11, so the midpoint is (3 + 11) ÷ 2 = 7, which holds N. Three elements ($ B 8) lie between K and N and three (T 5 ?) between N and R, which confirms it. T at place 8 and 8 at place 6 are the one-place slips to either side, and 5 at place 9 comes of counting the seven elements between K and R and then taking the wrong middle of them.