Given that a_{1} = 2 and a_{2} = 2
use a n =a n - 1 -1
Putting n = 3 ,a 3 =a 3-1 -1
a_{3} = a_{2} - 1 = 2 - 1 = 1
Putting n = 4 ,a 4 =a 4-1 -1
a_{4} = a_{3} - 1 = 1 - 1 = 0
Putting n = 5 ,a 5 =a 5-1 -1
a_{5} = a_{4} - 1 = 0 - 1 = - 1
Hence the five terms of sequence are 2, 2, 1, 0and - 1.
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Verified answer
Given that a_{1} = 2 and a_{2} = 2
use a n =a n - 1 -1
Putting n = 3 ,a 3 =a 3-1 -1
a_{3} = a_{2} - 1 = 2 - 1 = 1
Putting n = 4 ,a 4 =a 4-1 -1
a_{4} = a_{3} - 1 = 1 - 1 = 0
Putting n = 5 ,a 5 =a 5-1 -1
a_{5} = a_{4} - 1 = 0 - 1 = - 1
Hence the five terms of sequence are 2, 2, 1, 0and - 1.