True or false :3Z= Z+Z+Z when Z is the matrix
Let "Z=(z_{ij})." Taking into account that "3(z_{ij})=(3z_{ij})" and
"(z_{ij})+(z_{ij})+(z_{ij})=(z_{ij}+z_{ij}+z_{ij})=(3z_{ij}),"
we conclude that "3Z=Z+Z+Z."
Answer: true
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