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JAMB - Mathematics (1989 - No. 27)

If -8, m, n, 19 are in arithmetic progression, find (m, n)
1, 10
2, 10
3, 13
4, 16

解释

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

= 19 - n

m + n = 11

i.e. 1, 10

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