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49 = 4 + 3n - 3
49 = 3n + 1
3n = 48
n = 16 suku
beda = b = U2 - U1 = 7-4 = 3
Un = 49
n= ?
Un = a +(n-1)b
Un = 4 + (n-1)3
Un = 4 + 3n - 3
Un = 1 + 3n
49 = 1 + 3n
49 - 1 = 1 -1 + 3n
48 = 3n
n = 48/3
n = 16
maka banyak suku ialah 16