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20 = a - 4
a = 20+4
a = 24
S4 = n/2 x (2a + 3b)
= 4/2 x (48 - 3)
= 2 x 45
= 90
5) U3 = -11 = a+2b
U10=-60 = a+9b
a=3
b=-7
U6 = a+5b
= 3 + (-35)
= -32