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If the system of equtions 2x-y+z=0,x-2y+z=0, tx-y+2z=0 has infinitely many solution and f(x) be a continuous function such that f(5+x)+f(x)=2, then `f_(0)^(-2t)` f(x) dx is equal to

A

0

B

`-2t`

C

5

D

t

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The correct Answer is:
B
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