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Question 1 of 6
1 of 6
Which two sequences from the options below could be added to make the quadratic sequence which starts: 3, 7, 13, 21, ...?
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This sequence has a common second difference of 2 so will be of the form n2+bn+c. What sequence do you need to add to n2 to get 3, 7, 13, 21, ... ?
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