Question

Form possible 2 digit number using given digits 3,4,7

Answer 1

34,37,43,47,74,73
If digits are allowed to be repeated
33,44,77

Answer 2

Friend,

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Question: Form possible 2 digit number using given digits 3,4,7

Solution:

In order to form 2 digit numbers from given digits

we need to start from one end that is 

WE will start from left end 

first number is 3 then for this number write next and then after that and so on 

By using this we get 

34 , 37 , 47.

From other end we get 74, 73 , 43.

If we can use the digit twice then 33 , 44 , 77 can also be formed.

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Hope this helps you

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