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9 8 21 100 693 ?
(a) 6200
(b) 6330
(c) 6228
(d) 6230
(e) 6100
in Quantitative Aptitude
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$\\ 9\times 1 -1 =8 \\ 8 \times 3-3 = 21 \\21 \times 5-5=100 \\100\times 7-7=693 \\693 \times 9-9= 6228$

 

Hence,Option$(C)6228.$
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