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How many such pairs are possible if in both numbers units place is 1 more than tens place?

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2 two digit numbers chosen in such a way that all 4 digits used are distinct, are such that their sum is 90.
How many such pairs are possible if in both numbers units place is 1 more than tens place?

posted Jun 25, 2015 by Anamika

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1 Answer

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6 pairs
12 78
23 67
34 56
56 34
67 23
78 12

answer Jun 25, 2015 by Sivaselvaraj



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