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Find the missing number in the addition of the ... - WAEC Mathematics 2000 Question

Find the missing number in the addition of the following numbers, in base seven
\(\begin{matrix}
4 & 3 & 2 & 1\
1 & 2 & 3 & 4\
* & * & * & *\
1&2&3&4&1
\end{matrix}\)

A
3453
B
5556
C
6016
D
13453
correct option: a

4321\(_7\) + 1234\(_7\) = 5555\(_7\)

Missing number = 12341\(_7\) - 5555\(_7\)

= 3453\(_7\)

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