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How many whole numbers between 9 and 100 have an even digit-sum?

Posted in Math, asked by Crystaleen Baitan, 6 years ago. 4457 hits.

4

Answer=45

Between 9→20=6 nos       61→70=4nos

            21 →30=4 nos       71→80=6nos

            31→40=6nos         81→90=4nos

             41→50=4nos        91→100=5nos

             51→60=6nos      Therefore Total = 45

 

ANURAG BHUYAN
ANURAG BHUYAN - 6 years ago
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