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a + 6b = 31
_________ -
3b = 12
b = 4
a = 7
U50 = a + 49b
= 7 + 49(4)
= 7 + 196
= 203
a+6b = 31
3b = 12
b = 4
a+3.4 = 19
a= 7
a + (n-1).b
7 + 49.4
7+186 = 193