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Ch $04$ Sec $2$ Ex $23$ MAIN $-$ Sums and Products of Octal Expansions

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part. Find the sum and product of each of these pairs of numbers. Express your answers as octal expansions.

Ch $04$ Sec $2$ Ex $23($a$)-$ Sums and Products of Octal Expansions

The sum of the numbers $(763)8$ and $(146)8$ is $(1131$