U4 = a + 3b = 19U7 = a + 6b =37____________ _ -3b = -18 b = 3a + 3b = 19a + 3x3 = 19a = 19 - 9 = 10U24 = a + 23b = 10 + 23x3 = 10 + 69 = 79Sn = n/2 (a + Un)Sn = 24/2 (10 + 79) = 12 x 89 = ....
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U4 = a + 3b = 19
U7 = a + 6b =37
____________ _
-3b = -18
b = 3
a + 3b = 19
a + 3x3 = 19
a = 19 - 9 = 10
U24 = a + 23b = 10 + 23x3 = 10 + 69 = 79
Sn = n/2 (a + Un)
Sn = 24/2 (10 + 79) = 12 x 89 = ....