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

If the system of equations
`x+ y+z = 5`
`x+ 2y + 3z =9`
`x +3y + az = beta`
has infinitely many solutions, then `beta-alpha` equals

A

21

B

8

C

5

D

18

Text Solution

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The correct Answer is:
B
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