Which of the following is not true? a) (7 + 8) + 9 = 7 + (8 + 9) b) (7 × 8) × 9 = 7 × (8 × 9) c) 7 + 8 × 9 = (7 + 8) × (7 + 9) d) 7 × (8 + 9) = (7 × 8) + (7 × 9) Share with your friends Share 1 Atul Shaw answered this Dear student,a. It represents associative property of addition.Thus it is valid.b. It represent associative property of multiplication. Thus it is valid.c. No such identities is there.d. It represent distibutive property. Thus it is valid.One can also check by calculating RHS and LHS separately and then compareit.Regards 1 View Full Answer Vishwadeepti Mishra answered this C and d 1 Vishwadeepti Mishra answered this Accept my friend 1 Vishwadeepti Mishra answered this Request 0