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= 2m - m - 1
= m - 1
m = 1
Subtitusi m=1 ke 2m dan m +1
U2 = 2m
=2(1)
=2
U1 = a
= m+1
= 1 + 1
= 2
Beda :
U2-U1
= 2-2
=0
Jadi, beda dari barisan aritmetika tsb adalah 0