If a * b = 2a - 3b + ab, then 3 * 5 + 5 * 3 is equal to?
A. 22
B. 24
C. 26
D. 28
Answer: Option A
Solution(By Examveda Team)
$$\eqalign{ & 3*5 + 5*3 \cr & \Rightarrow 3*5 = 2 \times 3 - 3 \times 5 + 3 \times 5 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 6 - 15 + 15 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 6 \cr & \Rightarrow 5*3 = 2 \times 5 - 3 \times 3 + 3 \times 5 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 10 - 9 + 15 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 16 \cr & \therefore 3*5 + 5*3 \cr & \Rightarrow 6 + 16 = 22 \cr} $$This Question Belongs to Arithmetic Ability >> Algebra
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when we will find 3*5
here a=3, b=5,putting in equation given we will find value of 3*5
when we will find 5*3
here a=5, b=3, putting in equation given we will find value of 5*3
after that we will add them
what does mean by* in question