A) S1 = P - S2 - S3 B) S1 = P + S2 + S3 C) S1 = S2 + P - S3 D) S1 =...

91)A) s1 = P - s2 - s3 B) s1 = P + s2 + s3 C) s1 = s2 + P - s3 D) s1 = s2 + s3 - P