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30 = a + 4b
U10 = a + 9b
50 = a + 9b
a + 9b = 50
a + 4b = 30 -
-----------------------
5b = 20
b = 4
a + 4b = 30
a + 4*4 = 30
a + 16 = 30
a = 14
U7 = a + 6b
= 14 + 6*4
= 14 + 24
= 38
=20/5
=4
a=
u5 = a + 4.4
30= a + 16
30-16 = a
14 = a
u7 = a + (n-1). b
= 14 + 6. 4
= 14 + 24
= 38
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