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Number Theory Level pending

Any 2 consecutive two digit number a b ab and c d cd when reversed , b a ba and d c dc then we always get :

d c − b a = 10 dc-ba=10

Which form of two-digit consecutive number do not satisfy this rule?

Note:Here a b ab and c d cd are two digit number ,not products.

7 n − 1 , 7 n 7n-1,7n 8 n − 1 , 8 n 8n-1,8n 9 n − 1 , 9 n 9n-1,9n 5 n − 1 , 5 n 5n-1,5n 4 n − 1 , 4 n 4n-1,4n 10 n − 1 , 10 n 10n-1,10n

Siddharth Singh by Siddharth Singh , 20, India

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