55 60 67 78 91 108 ? a) 125 b) 121 c) 127 d) 89 e) None of these

55 60 67 78 91 108 ?
a) 125
b) 121
c) 127
d) 89
e) None of these
by

1 Answer

Answer :

55 + 5 = 60
60 + 7 = 67
67 + 11 = 78
78 + 13 = 91
91 + 17 = 108+108 + 19 = 127
Answer: c)
by

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