The square numbers are the values which are produced when we multiply a number by itself. Some of the properties are:
In other words, a perfect square leaves remainder 0 or 1 on division by 3.
Verification: The above property can be easily verified from the following computations:
Square number | Remainder when divided by 3 |
1 | |
0 | |
1 | |
1 | |
0 | |
1 | |
1 |
Application: If a number when divided by 3 leaves remainder 2, then it is not a perfect square.
In other words, a perfect square leaves remainder 0 or 1 on division by 4.
We have,
Sum of first 1 odd natural number,
Sum of first 2 odd natural numbers,
Sum of first 3 odd natural numbers.
Sum of first 4 odd natural numbers.
Without adding,find the sum: 1+3+5+7+9+11+13+15+17+19+21+23 | |||
Right Option : C | |||
View Explanation |
The square of -9 is _______________ | |||
Right Option : B | |||
View Explanation |
289 can be express as the sum of first ___________________ consecutive odd numbers. | |||
Right Option : B | |||
View Explanation |
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