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Verified answer
Un = a + ( n - 1 ) bU8 = a + 7b = 31
U14 = a + 13b = 55
--------------------------(-)
- 6b = - 24
a = 4
a + 7b = 31
4 + 7b = 31
7b = 31 - 4
7b = 27/7
U22 = a + 21b
= 4 + 21(27/7)
= 4 + 81
= 85