Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 31)
31.
On dividing a number by 5, we get 3 as remainder. What will the remainder when the square of the this number is divided by 5 ?
Answer: Option
Explanation:
Let the number be x and on dividing x by 5, we get k as quotient and 3 as remainder.
x = 5k + 3
x2 = (5k + 3)2
= (25k2 + 30k + 9)
= 5(5k2 + 6k + 1) + 4
On dividing x2 by 5, we get 4 as remainder.
Discussion:
37 comments Page 4 of 4.
Mohammed said:
8 years ago
How could come 30 k in above equation?
Ashi said:
9 years ago
@Nil.Dhongde.
The answer is 1.
The answer is 1.
Sanju said:
1 decade ago
Thanks Neha for easy shortcut.
Lopa said:
1 decade ago
Thanks rajesh for this method.
Kamila Banu said:
4 years ago
= 3 * 3 = 9.
= 9 - 5 = 4.
= 9 - 5 = 4.
Narendra said:
1 decade ago
Thanks for the shortcut.
Pema said:
5 years ago
Thank you @Neha Nagar.
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