Calculate 243 six 243 five expressing your answ... - JAMB Mathematics 2018 Question
Calculate 243\(_{six}\) – 243\(_{five}\) expressing your answer in base 10
A
0
B
1
C
26
D
46
correct option: c
Since they are of different base, convert to base 10
243\(_{six}\) = (2 x 62) + (4 x 61) + (3 x 60)
= 72 + 24 + 3 = 99 base 10
243\(_{six}\) = 2 x 52 + 4 x 51 +3 x 50
50 + 20 + 3 = 73 base 10
Subtracting them, 99 - 73
= 26
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