If three arithmetic means are inserted between 5 and 25, the second arithmetic mean is _____?
FPSC 5 Years Past Papers Subject Wise (Solved With Details) / All — Multiple-choice practice
- A. 20
- B. 15
- C. None of these
- D. 10
Correct answer
15
Explanation
Explanation 5, _, _, _, 25 There are 5 terms. Let's find the common difference: d = 25-5/4 = 20/4 = 5 The sequence is: 5 + 5 = 10 10 + 5 = 15 15 + 5 = 20 20 + 5 = 25 The sequence is 5, 10, 15, 20, 25 The second arithmetic mean is 15 .
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