Find the Missing Number

The array {1, 2, 4, 5, 6} should contain the numbers 1 through 6, but exactly one is missing. Find and print the missing number (see Expected Output).

The full sum of 1 through 6 is 21. Subtract the actual array sum from that to find the gap. Use the formula n * (n + 1) / 2 with n = 6.

Expected Output:

3↵

= newline. The output ends with a newline — print one after the last line.

Hints4 available

Topics:

Arrays

Code Editor

Tab to indent (Esc then Tab to move on) · Ctrl+Enter to run · Shift+Alt+F to format · Ctrl+Space to expand shortcuts (sysout, psvm, fori)

Your Output

Run your code to see the output here...

Test Cases

Run your code to see test case results.