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n= 50
U12-U7 = 30
a+11b - (a +6b) =30
2+11b - 2 -6b =30
5b = 30
b = 30/5
b=6
U12 - U7 = 30
(a+11b) - (a+6b) = 30
a+11b-a-6b = 30
5b = 30
b = 30/5
b = 6