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Question

Divide the expression
(ax+by+bx+az+ay+bz) by (a+b).

A
(x+y+z)
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B
(x+y+b)
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C
(x+y+a)
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D
(x+y)
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Solution

The correct option is A (x+y+z)
Given: ax+by+bx+az+ay+bz(a+b)
Consider the numerator,
ax+by+bx+az+ay+bz=(ax+ay+az)+(bx+by+bz)
Taking 'a' common from the first group and 'b' common from the second group, we get
=a(x+y+z)+b(x+y+z)
=(x+y+z)(a+b)
Therefore,
ax+by+bx+az+ay+bz(a+b)=(x+y+z)(a+b)(a+b)=(x+y+z)

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