Back in 1990 I wrote the date 3/30/90 and noticed that the month times the day gave the year (3*30=90). I noticed it again on October 9: 10*9=90. That made me wonder: how many times did that occur in the decade of the 90’s?

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ISBN:9780470458365
Author:Erwin Kreyszig
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Back in 1990 I wrote the date 3/30/90 and noticed that the month times the day gave the year (3*30=90). I noticed it again on October 9: 10*9=90. That made me wonder: how many times did that occur in the decade of the 90’s?

 

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