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a=-4
beda(b)=-1-(-4)=3
n=12
jdi
U12= a+(n-1)b
U12=4+11.3
=132
b = U2 - U1 = -1 - -4 = 3
u12 = a + 11b = -4 + 11.3 = -4 + 33 = 29