What should come in place of the question mark (?) in the given series?
55, 60, 59, 64, 63, ?

Given: 55, 60, 59, 64, 63, ?

Logic: Numbers are increasing and decreasing + 5 and - 1 alternately.

55 + 5 = 60

60 - 1 = 59

59 + 5 = 64

64 - 1 = 63

63 + 5 = 68

So, the missing term is 68.

Thus, correct option is (c).