What should come in place of question mark (?) in the following number/alphabetic series. 12 34 54 71 84 ?

What should come in place of question mark (?) in the following number

1.	What should come in place of question mark (?) in the following number/alphabetic series. 12  34  54  71  84  ?
A.	89
B.	92
C.	124
D.	102
Answer» C. 124

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What should come in place of question mark (?) in the following number/alphabetic series. 12&nbsp; 34&nbsp; 54&nbsp; 71&nbsp; 84&nbsp;&nbsp;?

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What should come in place of question mark (?) in the following number/alphabetic series. 12 34 54 71 84 ?