Question

If a1=a2=2, an=a+n-1(-3), n>2
Then find AP




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Answer 1

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Answer 2

Answer:

AP:2,2,1,0,-1

Step-by-step explanation:

it is given that ;

a₁=2

a₂=2

now for a₃ onwards,we have to use formula

an=(an-₁) -1

therefore putting n=3

a₃=(a₃-₁)-1

a₃=a₂-1

a₃=2-1   [a₂=2]

a₃=1

now n=4

a₄=(a₄-₁)-1

a₄=a₃-1

a₄=1-1   [a₃=1]

a₄=0

now n=5

a₅=(a₅-1)-1

a₅=a₄-1

a₅= 0-1   [a₄=0]

a₅=-1  

therefore we got the AP:2,2,1,0,-1....