Question

1. an= n(n+2), write first five terms
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Answer 1

Answer: $a_{n}$=n(n+2)

$a_{1}=1(1+2)=3\\ a_{2}=2(2+2)=8\\a_{3}=3(3+2)=15\\a_{4}=4(4+2)=24\\a_{5}=5(5+2)=35$

AP= 3,8,15,24,35

Answer 2

Answer:

Step-by-step explanation: