with a two digit prime number, if 18 is added, we get another prime number with digits reversed. How many such numbers are possible?
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18 is added.
So 18/9=2.
Difference between digits =2.
Nos are :
13 or 31
24 or 42
57 or 75
68 or 86
79 or 97
35 or 53
46 or 64
Prime nos are 13, 31, 53, 79
Therefore there are 4 such numbers
So 18/9=2.
Difference between digits =2.
Nos are :
13 or 31
24 or 42
57 or 75
68 or 86
79 or 97
35 or 53
46 or 64
Prime nos are 13, 31, 53, 79
Therefore there are 4 such numbers
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