Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 5)
5.
1397 x 1397 = ?
Answer: Option
Explanation:
| 1397 x 1397 | = (1397)2 |
| = (1400 - 3)2 | |
| = (1400)2 + (3)2 - (2 x 1400 x 3) | |
| = 1960000 + 9 - 8400 | |
| = 1960009 - 8400 | |
| = 1951609. |
Discussion:
57 comments Page 3 of 6.
Ajith said:
9 years ago
@Isha.
Whether it is applicable to all type of problems like this?
Whether it is applicable to all type of problems like this?
Shweta said:
8 years ago
Nice explanations thank you all.
Rohit said:
9 years ago
Just multiply.
1397
1397
After multiplying for the second time just add and see the last 3digits are coming to 609 then its easy to ascertain or you can take the nearest whole number, whichever seems easy for you.
1397
1397
After multiplying for the second time just add and see the last 3digits are coming to 609 then its easy to ascertain or you can take the nearest whole number, whichever seems easy for you.
Rohini said:
8 years ago
Thank you all for explaining the solution.
Venkat Reddy Mula said:
8 years ago
@Aruna.
Your method is perfect, Thanks.
Your method is perfect, Thanks.
Sitaram said:
8 years ago
Very easy method, Thanks @Aruna.
Kiran said:
8 years ago
How come 1400?
Ajay said:
1 year ago
@Pramod.
Very clear and understanding. Thanks for your explanation.
Very clear and understanding. Thanks for your explanation.
Vadham said:
2 weeks ago
Nice, Thanks all for explaining the answer.
Yakula Nandini said:
2 weeks ago
I think the correct answer is 1951609.
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