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A binary operation Ꚛ is defined by m Ꚛ n = mn + m – n, on the set of real numbers, for all m, n ϵ R. find the value of 3 Ꚛ (2 Ꚛ 4)
- A. 25
- B. 6
- C. 15
- D. 18
To correctly solve this, we would firstly have to deal with the bracket, and then the answer obtained will be used to finally compute the answer.
If m Ꚛ n = mn + m – n,
Then 2 Ꚛ 4 = (2 X 4) + 2 – 4
= 8 + 2 – 4
= 10 – 4
Finally, using this 6 to complete the calculation, we have:
3 Ꚛ 6 = (3 X 6) + 3 – 6
= 18 + 3 – 6
= 21 – 6 = 15
Now for the right answer to the above question:
- Option A is incorrect.
- Option B is incorrect.
- C is correct.
- D is not the correct answer.
You may please note these/this:
- Remember to firstly use the operation to resolve the bracket, and then perform the final operation to obtain the answer.
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/culled from 2019 JAMB-UTME mathematics question 3/