21 . F i n d   t h e   s u m   o f   t h e   s e r i e s   : ( 3 3 - 2 3 ) + ( 5 3 - 4 3 ) + ( 7 3 - 6 3 ) + . . . . . . . t o i ) n   t e r m s         i i ) 10   t e r m s

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