[ Programming & Design ] Open Question : how to check a probability of number?

hi i want to check the probability of a number when its added together in excel. i.e probability of 10 in the array given 123456789101112131415161718 12345678910111213141516171819 234567891011121314161618182020 3456789101112131415191721192321 45678910111213141516231825202722 567891011121314151617281930213223 6789101112131415161718342036223824 78910111213141516171819412143234525 891011121314151617181920492251245326 9101112131415161718192021582360256227 10111213141516171819202122682470267228 11121314151617181920212223792581278329 12131415161718192021222324912693289530 13141516171819202122232425104271062910831 14151617181920212223242526118281203012232 15161718192021222324252627133291353113733 16171819202122232425262728149301513215334 17181920212223242526272829166311683317035 18192021222324252627282930184321863418836 out of this array the probability would be 9+1=10 8+2=10 7+3=10 6+4=10 5+5=10 4+6=10 3+7=10 2+8=10 1+9=10