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U5 = 18
a+2b = 10
a+4b = 18
----------------- -
-2b = -8
b = 4
a+2b = 10
a+8 = 10
a = 2
U75 = n/2 (2a +(n-1) b)
= 75/2 (2.2+ (75-1)4)
= 75/2 (4 + 296)
= 75/2 (300)
= 75 . 150
= 11250