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Anonymous
197,becoz it the only no which is not divisible by 5......
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Answer is 9......
10 21 51 155 540 2163
make a pair of two.....
(10 21) 10x2=20+1=21
(51 155) 51x3=153+2=155
(540 2163)540x4=2160+3=2163
97