#
78a

*

9b

=

73790

find a,b

Please find below the solution to the asked query:

We have : 78 a $\times $ 9 b = 73790

Here we can see that unit digit is ' 0 ' , So

we can take a = 2 , 4 or 8 If we take b = 5

Or

If we take a = 5 and b = 2 , 4 or 8

Now we use hit and trial method by taking different combinations ,

Case I : we take a = 2 and b = 5 then

782 $\times $ 95 = 74290 ( Not verified )

Case I we take a = 5 and b = 4 then ,

785 $\times $ 94 = 73790 ( Verified )

Therefore,

**a = 5 and b = 4 ( Ans )**

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