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Explanation:

Sum of six numbers = 6 × m = 6m

Sum of first three numbers = 3 × y = 3y
Sum of last three numbers = 3 × z = 3z

Sum of all 6 numbers = Sum of first 3 numbers + Sum of last 3 numbers
⇒ 6m = 3y + 3z
⇒ 2m = y + z

Hence, option (a). 


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