If -8, m, n, 19 are in arithmetic progression, find (m, n)

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Mathematics JAMB 1989

If -8, m, n, 19 are in arithmetic progression, find (m, n)

  • 1, 10 checkmark
  • 2, 10
  • 3, 13
  • 4, 16

The correct answer is: A

Explanation

-8, m, n, 19 = m + 8

= 19 - n

m + n = 11

i.e. 1, 10
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