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an=2n-1 what is a sequence?

Sagot :

The nth term is computed by:
nth term= 1st term + (n-1)d 
= 2n - 1

We can tell that d=2

1st term + 2n - 2 = 2n - 1
1st term - 2 = -1
1st term = 1

Therefore the terms are 1,3,5,7,9...
which are odd numbers.