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Just Math
Nine forever (
Posted on 2015-09-30
)
Prove
that if the digits of
N
, read from left to right, form a strictly increasing sequence, the sum of the digits of
9*N
is always
9 (nine)
.
You are requested to formally
prove
, not to verify.
No Solution Yet
Submitted by
Ady TZIDON
Rating:
4.0000
(1 votes)
Comments: (
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)
Subject
Author
Date
re: Aha! (spoiler)
Jer
2015-09-30 17:32:16
Aha! (spoiler)
Steve Herman
2015-09-30 14:59:06
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