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:
55 comments Page 3 of 6.
Isha said:
8 years ago
1+3+9+7=20 =>2+0=2.
1+3+9+7=20 =>2+0=2.
2+2=4.
a) 1+9+5+1+6+0+9=31 =>3+1=4 (4 equal to 4) so it is answer.
b)1+9+8+1+7+0+9=35 =>3+5=8 (8 not equal to 4) wrong.
1+3+9+7=20 =>2+0=2.
2+2=4.
a) 1+9+5+1+6+0+9=31 =>3+1=4 (4 equal to 4) so it is answer.
b)1+9+8+1+7+0+9=35 =>3+5=8 (8 not equal to 4) wrong.
Rohit said:
8 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.
Kabita said:
8 years ago
@Sindu.
Please tell me How 3 came?
Please tell me How 3 came?
Shweta said:
7 years ago
Nice explanations thank you all.
Rohini said:
7 years ago
Thank you all for explaining the solution.
Venkat Reddy Mula said:
7 years ago
@Aruna.
Your method is perfect, Thanks.
Your method is perfect, Thanks.
Sitaram said:
7 years ago
Very easy method, Thanks @Aruna.
Kiran said:
7 years ago
How come 1400?
Ajay said:
1 month ago
@Pramod.
Very clear and understanding. Thanks for your explanation.
Very clear and understanding. Thanks for your explanation.
Sonal said:
1 decade ago
@Sravani.
How can you calculate the number of 779?
Can you explain it again?
How can you calculate the number of 779?
Can you explain it again?
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