Question

| Question 2 |

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Answer 1

45. Since the pattern is the previous number plus one, just multiply 21 by 2 and add it to 3, the first term.

Answer 2

a22 = 3 + (22 - 1) * 2

a22 = 3 + 21 * 2

a22 = 3 + 42

a22 = 45