- A. 15
- B. 12
- C. 42
- D. None of these
Correct Answer: C. 42
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The arithmetic mean (A.M) between any two numbers a and b is (a+b)/2.
So, the arithmetic mean between 18 and 3 is:
(18 + 3)/2 = 21/2 = 10.5
To find the sum of 4 arithmetic means between 18 and 3, we can use the formula:
Sum of n A.M = n x A.M
Substituting the values, we get:
Sum of 4 A.M = 4 x 10.5 = 42
Therefore, the sum of 4 arithmetic means between 18 and 3 is 42.