If Sn+1 = 4n + 5, then find Sn
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then putting n =n-1
we have S(n-1)+1=4(n-1)+5
or Sn=4n-4+5
=4n+1..............(ans)
we have S(n-1)+1=4(n-1)+5
or Sn=4n-4+5
=4n+1..............(ans)
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