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Encontrar a razão da PA
an = a1 + ( n -1) . r
48 = -12 + ( 6 -1) . r
48 = -12 + 5r
60 = 5r
r = 12
===
an = a1 + ( n -1) . r = an
an = -12 + ( 1 -1) .12 = -12
an = -12 + ( 2 -1) .12 = 0
an = -12 + ( 3 -1) .12 = 12
an = -12 + ( 4 -1) .12 = 24
an = -12 + ( 5 -1) .12 = 36
an = -12 + ( 6 -1) .12 = 48
PA = ( -12, 0, 12, 24, 36, 48)
an = a1 + ( n -1) . r
48 = -12 + ( 6 -1) . r
48 = -12 + 5r
60 = 5r
r = 12
===
an = a1 + ( n -1) . r = an
an = -12 + ( 1 -1) .12 = -12
an = -12 + ( 2 -1) .12 = 0
an = -12 + ( 3 -1) .12 = 12
an = -12 + ( 4 -1) .12 = 24
an = -12 + ( 5 -1) .12 = 36
an = -12 + ( 6 -1) .12 = 48
PA = ( -12, 0, 12, 24, 36, 48)
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