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I didn't understand the solution please clarify.
m invertable matrix hai jaiski entry 0 and 1 hai M invertable hai so all daigonal elements 1 remaining 20 elements 0 and 1 we have to find number of 0 and 1 whose difference least so least difference is 1
0 1 |n1-n0| 20 5. 15 19 6. 13 18 7. 11 17 8 9 16 9. 7 15 10. 5 14 11 3 13 12. 1 least value 1
understand
but how can I be assured that the matrix with 13 zeros and 12 ones is indeed an invertible matrix?
daigonal fix kar diya 1 1 se sabhi daigonal elements 1 hai remaining mai select kiye