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The Root of Pie (Posted on 2019-03-14) Difficulty: 1 of 5
Solve this alphametic: sqrt(PI) + E = sqrt(PIE).
All three digits are distinct digits 1-9.

See The Solution Submitted by Brian Smith    
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Solution Puzzle Solution Comment 2 of 2 |
Since E is a positive base 10 digit, it follows that each of V(PIE) and V(PI) is a positive integer, so that each of PI and PIE is a perfect square.
This is possible whenever:
(PI, PIE) = (16,169), (25,256) and (36,361)
Now:
(PI, PIE) = (16, 169) gives: V(PI) +E = 4+9=13=V(169)= V(PIE)
(PI, PIE) = (25, 256) gives: V(PI) +E = 5+6=11=V(121) /= V(PIE), a  contradiction 
(PI, PIE) =(36,361) gives: V(PI) + E = 6+1=7= V(49) /= V(PIE), contradiction. 

Consequently,  (P, I, E) =(1,6,9) is the required solution to the given alphametic.

Edited on January 8, 2022, 10:09 pm
  Posted by K Sengupta on 2022-01-08 22:05:33

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