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  • Brainly User
2016-02-23T10:20:41+05:30

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@nswer is 10*9=90+9=99
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2016-02-23T10:23:54+05:30
Answer is 99.
multipying 1st 2 no and adding a series of odd numbers.

2 3=6 +(1)      =7
5 4=20+(3)      =23
6 7=42+(5)      =47
8 9=72+(7)      =79
9 10=90+(9)  = 99.

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