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1. If * is defined for all positive real numbers a and b by a*b=ab/(a+b), then 10*2=?
- A. 5/3
- B. 5/3
- C. 5/3
- D. 5/3
Answer: Option A
Explanation:
According to the question,
a = 10
b = 2
Then, a*b = ab/(a + b)
or, 10*2 = 10×2/(10 + 2)
or,10*2 = 20/12
or,10*2 = 5/3
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