lf aa=3n-9 then a6 is
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Given : aₙ = 3n-9
To find : a₆
Solution:
aₙ = 3n-9
aₙ is nth term of
to find a₆
substitute n = 6
=> a₆ = 3(6) - 9
=> a₆ = 18 - 9
=> a₆ = 9
aₙ = 3n-9
=> aₙ = 3n-3 - 6
=> aₙ = 3(n-1) - 6
=> aₙ = - 6 + (n-1)3
a = - 6
d = 3
AP is
- 6 , - 3 , 0 , 3 , 6 , 9 ....................
a₆ = 9
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