A) 102
B) 112
D) None of these
Multiply each number by 2 and add 1,2,3,4….
2×2+1=52×2+1=5
5×2+2=125×2+2=12
12×2+3=2712×2+3=27
27×2+4=5827×2+4=58
58×2+5=121
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