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197,becoz it the only no which is not divisible by 5......

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12y ago
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Wiki User

13y ago

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

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13y ago

97

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Q: Which one is wrong in series 9 21 51 155 540 2163?
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