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u9.... a + 8b = 37 -
............-5b = -20
b = 4
a =5
u41...a + 40b = 5 + 40*4 = 5 + 160 = 165
U4 ⇒ U1 + 3b = 17
U9 ⇒ U1 + 8b = 37 -
-5b = -20
b = 4.
U1 + 3b = 17
U1 + 12 = 17
U1 = 5.
U41 = U1 + 40b
= 5 + 40.4
= 5 + 160
= 165.