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a1=4 * 1 - 3 = 1
a2=4 * 2 - 3 = 5
a3 = 4 * 3 - 3 =9
r wynosi 4 a a1 to 1
b)
a1=5+2=7
a2= 5 * 2 + 2 = 12
a3= 5 * 3 + 2 = 17
a1= 7 r = 5