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Beware of bugs in the above code;
I have only proved it correct, not tried it.
— Donald Knuth, 1977-03
n←10
+/ ⍳n
45
2 ÷⍨ (+/⍳n) + (+/⍳n)
45
2 ÷⍨ +/ (⍳n) + (⍳n)
45
2 ÷⍨ +/ (⍳n) + ⌽⍳n
45
2 ÷⍨ +/ n ⍴ n-1
45
2 ÷⍨ n × n-1
45
2 ! n
45
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(⍳n)
0 1 2 3 4 5 6 7 8 9
⌽⍳n
9 8 7 6 5 4 3 2 1 0
(⍳n) + ⌽⍳n
9 9 9 9 9 9 9 9 9 9
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