21
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Oh, what a lovely question! You can create 6 combinations by repeating the same number 4 times. It's like painting a beautiful pattern with numbers - 1111, 2222, 3333, 4444, 5555, and 6666. Each combination is unique and special in its own way, just like every brushstroke on a canvas.
(7777-6666)/1111 = 1 (4444+5555)/(9999/3333) = 3 8888/2222 = 4 4*3 + 1 =13
This is impossible. 21 is an odd number and all these digits are odd. Whenever you add 6 odd numbers together, the answer is always even!
9+9+9+9=36-5-5-5-5=16+3+3+3-3=22+1-1-1/1=21