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(a+6b)-(a+b)=15
a+6b-a-b=15
5b=15
b=15/5=3
U5=19
a+4b=19
a+4(3)=19
a+12=19
a=19-12=7
U12= a+(12-1)b
=7+11(3)
=7+33=40 (A)
(a+6b)-(a+b)=15
a+6b-a-b=15
5b=15
b=3
U5=19
a+4b=19
a+4(3)=19
a+12=19
a=7
Un=a+(n-1)b
U12=7+11(3)
U12=7+33
U12=40 (A)