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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)

1 Answer

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Best answer

(C) 7 + 8 × 9 = (7 + 8) × (7 + 9)

Consider the left hand side = 7 + 8 × 9

= 7 + (8 × 9)

= 7 + 72

= 79

Now, consider the right hand side = (7 + 8) × (7 + 9)

= 15 × 16

= 240

By comparing LHS and RHS

LHS ≠ RHS

79 ≠ 240

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