Question

92613 x 62742241 = ? + 89

Find the value of '?'
A) 166251
B) 166259
C) 166252
D) 166253

Answer 1

Q:

9261−−−−√3 x 62742241−−−−−−−−√ = ? + 8992613 x 62742241 = ? + 89
Find the value of '?'

A) 166251
B) 166259
C) 166252
D) 166253

Answer:   C) 166252 

Explanation:

Given 9261−−−−√3 x 62742241−−−−−−−−√ = ? + 8992613 x 62742241 = ? + 89
 
Using unit digit method,
 
On LHS,
 
1 x 1 x 1 = 1
 
sqrt of last digit 1 => it must end with either 9 or 1
 
so now
 
1 x 1 = 1
 
1 x 9 = 9
 
On RHS,
 
? + 89
 
=> ? = ...1 - 89 = last digit is 11- 9 = 2
 
or
 
=> ? = ...9 - 89 = last digit is 9 - 9 = 0
 
Here in the options last digit 2 is option C.

Answer 2

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Here's your Answer...

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On LHS,

1 x 1 x 1 = 1

sqrt of last digit 1 => it must end with either 9 or 1

so now

1 x 1 = 1

1 x 9 = 9

 

On RHS,

? + 89

=> ? = ...1 - 89 = last digit is 11- 9 = 2

or

=> ? = ...9 - 89 = last digit is 9 - 9 = 0

Here in the options last digit 2 is option C.
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