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To work out a term, replace the n with the position in the sequence, e.g. The 1st term is (4 x 1) - 5 which is - 1. The 4th term... Replace the 1 with a 4 so you have (4 x 4) - 5. Another way to check your answer in these questions is to look at what the n is multiplied by. In this case we have 4n, so we have a sequence which increases by 4 each time.
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*+*=7. *+*=10. *+*=13. *+*+*= ?
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