In the following question, select the missing number from the given series:
67, 70, 74, 77, 81, 84 ?
'3' and '4' are alternatively added.
67Â + 3 = 70
70Â + 4 =Â 74
74Â + 3 =Â 77
77Â + 4 =Â 81
81Â + 3 =Â 84
84 + 4 =Â 88
=> Ans - (B)
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