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10, 9, 60, 90, 70, 66, ?
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Decode the Number series and find the next number in the series: 10, 9, 60, 90, 70, 66, ?

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In this case, first spell out the sequence
ten
nine
sixty
ninety
seventy
sixtysix

ten 10 is max number for which 3 characters are used
nine 9 is max number for which 4 characters are used
sixty 60 is max number for which 5 characters are used
similarly 90 - 6 characters
70 - 7 characters
66 - 8 characters
Next number will be the maximum number for which 9 characters are used. It is 96
96 - 9 characters

and the next numbers in this series will be
10*10^9 = ten billion
10*10^12 = ten trillion
10*10^33 = ten decillion
10*10^24 = ten septillion
10*10^36 = ten undecillion
10*10^63 = ten vigintillion

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