When 2 background colors B1 and B2 are mixed with foreground color F, the resulting pixel color P is

(a) P=t0*F+t1*B1+(1-t0-t1)B2

(b) P=t0*F-t1*B1+(1-t0-t1)B2

(c) P=t0*F+t1*B1+(1+t0+t1)B2

(d) Only a

This question was addressed to me in an interview.

My query is from Area Fill Attributes in portion Graphics Primitives of Computer Graphics

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