What Is The Next Solution Here? And The Final Answer?

What is the next solution here? And the final answer?

Answer:

a₆ = 14

Step-by-step explanation:

an = n(n+1)/3

n = 6

a₆ = 6(6+1)/3

a₆ = 6(7)/3

a₆ = (42)/3

a₆ = 14


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