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Write the rule for finding the nth term.

1. 5,9,13,17 Rule: _____________________ <= no.1
2. 6, 12, 18, 24, Rule: _____________________ <=no.2
3. 20, 16, 12, 8, Rule: _____________________ <=no.3
4. 2, 5, 8, 11, Rule: _____________________ <=no.4
5. 27,24,21 ,18 Rule: _____________________ <=no.5​