Answer :

4, 12, 20

Series would be: 4 + 8 * (n - 1) = 4 + 8n - 8 = 8n - 4

n = 1 ==> 4

n = 2 ==> 12

n = 3 ==> 20

n = 41 ==> 4 + 8 *(41 -1) = 4 + 8 * 40 = 4 + 320 = 324

Answer:

324

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