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Find the number that can be put in place of the question mark. 3 12 7 26 15 b?
A64
B55
C45
D54
Answer: Option (Login/Signup)
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SHORTCUT
Alternate:
(3,7,15) (12,26,b)
7-3=4 , 15-7=8=(4*2)
like so,
26-12=14 , b-26=14*2
b=28+26=54
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