4. The common difference when a 10-as= 200 is c) 50 d) 60 b) 40 a) 30
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ANSWER: 30-600
40-800
50-1000
60-1200
EXPLANATION: 2 x 1 = 2
2 x 2 = 4
2 x 3 = 6
2 x 4 = 8
2 x 5 = 10
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