EM-1515

Number patterns and the nth term

E Math · Secondary 4 · Hard · Number patterns and the nth term

1. $u_n = 5n + 4,\ u_{30} = 154$
2. $u_n = 4n + 5,\ u_{30} = 125$
3. $u_n = 5n - 4,\ u_{30} = 146$
4. $u_n = 9n,\ u_{30} = 270$

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