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ohh nice thanks for it

The structure of Sweet Home, based on a comic of the same name by Kim Carnby and Hwang Young-chan, is more or less the same as many of the post-apocalyptic shows we’ve seen in recent years. We’re introduced to a group of disparate personalities, all of whom have their own struggles in their lives, and then the zombies or monsters or whatever mutant life forms threaten the remainder of humanity show

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.