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2016-02-12T22:26:39+05:30

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Since we know the relation that
   a_{n}  S_{n} - S_{n-1}
⇒  a_{21}  S_{21} - S_{20}
       = 1250 - 1200
        = 50
Therefore, it's 21th term is 50 
1 5 1
2016-02-12T22:32:25+05:30
S21=1250
S20=1200
a21=S21-S20
a21=1250-1200
a21=50
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