In given question there is a number series with one term missing shown by question mark this term is one of the alternative given choose that number 7, 15,32,?, 138,281
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The answer is 67
7*2+1=15
15*2+2=32
32*2+3=67
67*2+4=138
138*2+5=28
7*2+1=15
15*2+2=32
32*2+3=67
67*2+4=138
138*2+5=28
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