a=-1 d= 1/2
Arithmetic progression
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Explanation:
what to find ? I am finding a of n
an = a+(n-1)d
an = 1 + (n-1) 1/2
an = 1+n/2-1/2
an =(n+1/2) -1/2
an = 2n/4
an= n/2
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