Select the number that can replace the question mark (?) in the following series.
223, 111, ?, 27, 13, 6.

Correct option is D

Logic is based on decreasing differences of 112, 56, 28, 14, and 7, let's apply this to the series:
223, 111, ?, 27, 13, 6
223 - 111 = 112 (Difference: 112)
111 - ? = 56 (Difference: 56)
So,
?=111−56=55
55 - 27 = 28 (Difference: 28)
27 - 13 = 14 (Difference: 14)
13 - 6 = 7 (Difference: 7)
Thus, the missing number in the series is 55.
Correct answer is (d) 55.