Question

i am a prime number between 70 and 100 . my tens digit is one less than my ones digit .​

Answer 1

Answer:

89 as tens digit is 1 less than ones digit and there is nothing in the 70s section

Answer 2

Given : a prime number between 70 and 100 .  

tens digit is one less than  ones digit .​

To Find : Number

Solution:

number between 70 and 100 .

Hence Tens digit can be

7 , 8 or 9

Now  tens digit is one less than  ones digit .​

Hence Tens Digit can not be 9   as its largest digit

for 7 as tens digit 8 is unit digit

for 8 as tens digit 9 is unit digit

Hence 78 and 89 are 2 possible numbers

78 = 2 * 3 * 13  

Hence not a prime number

so 89 is the correct answer

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