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x(1),x(2),x(3)"…." are in A.P. If x(1)+x...

`x_(1),x_(2),x_(3)"…."` are in A.P. If `x_(1)+x_(7)+x_(10)=-6 and x_(3)+x_(8)+x_(12)=-11 ` , then `x_(3)+x_(8)+x_(22)` =

A

`-21`

B

`-15`

C

`-18`

D

`-31`

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