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b) 1001 (₂) = 2³+2⁰=8+1=9 (₁₀)
c) 111 (₂)=2²+2+1=4+2+1=7 (₁₀)
d) 11011 (₂)=2⁴+2³+2+2⁰=16+8+2+1=27 (₁₀)
e) 20 (₃)=2*3=6 (₁₀)
f) 210 (₃)=2*3²+3=18+3=21 (₁₀)
g) 102 (₃)=3²+2*3⁰=9+2=11 (₁₀)
h) 2010 (₃)=2*3³+3=2*27+3=57 (₁₀)