What should come in place of the question mark (?) in the given series?
911, 912, 914, 917, 921, ?​​

Given: 911, 912, 914, 917, 921, ?​​

Logic: Numbers are increasing + 1, + 2, + 3, + 4 and + 5 place.

911 + 1 = 912

912 + 2 = 914

914 + 3 = 917

917 + 4 = 921

921 + 5 = 926

So, the missing term is 926.

Thus, correct option is (a).