Number Series type 1.2

Que :- Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?
Ans :- a.( 13 )         b.( 10 )          c. ( 14 )            d.( 16 ) 

We can solve this Number series 

Number Series type 1.2-a

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Number Series type 1.2-b

Another Way