But is the answer unique?

Algebra Level 3

4,  44,  444,  …,  44444…4⏟N number of 4’s 4, \; 44, \; 444, \; \ldots , \; \underbrace{44444\ldots4}_{N \text{ number of 4's}}

If average of the numbers above is equal to 9876, find NN.

Pi Han Goh by Pi Han Goh
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