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If the system fo equations x+y+z = 5 ...

If the system fo equations
x+y+z = 5
x + 2y + 3z = 9
`x + 3y + alphaz = beta`
has infinitely many solution, then `beta - alpha` equals

A

5

B

18

C

21

D

8

Text Solution

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The correct Answer is:
D
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