**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**

**QUICK ANSWER…**

**C**

**SOLUTION****… **** **

**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**

** = 6**

**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.**

**QUICK TIPS…**

**You may please note the****se/this****:**

**Remember to firstly use the operation to resolve the bracket, and then perform the final operation to obtain the answer.**

**Use the questions and answers session to correct, express, and contribute your views.**

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**/****culled from ****201****9**** JAMB-UTME ****mathematics ****question**** 3****/**