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b=2
Sn=432
Sn = n/2 (2a+nb - b)
432 = n/2 (14 + 2n -2)
432 =n/2 (12 + 2n)
432 = 6n + n^2
n^2 + 6n - 432 =0
(n-18)(n + 24 ) =0
n=18 atau n=-24
jadi banyak suku ada 18
Suku ke 18 = a +17b
= 7 + 34 =41