Addition of Consecutive Odd Natural Numbers

Q.

Express $121$ as the sum of $11$ odd numbers.

Q. Find the smallest number by which 1944 should be divided, so that the quotient is a perfect square.

1. 3
2. 2
3. 6
4. 12

Q. Find the smallest prime number dividing the sum $7^{11}+{11}^{13}$.

1. 5
2. 2
3. 3
4. 7

Q.

Find the value of
(1 + 3 + 5 + 7 + 9 + 11 + 13 + 15).

1. 36

2. 49

3. 25

4. 64

Q. Fill in the blanks:
$6^2+7^2+$ ___ $={43}^2$ is

1. ${84}^2$
2. ${36}^2$
3. ${49}^2$
4. ${42}^2$

Q. Find the smallest prime number dividing the sum $3^{11}+5^{13}$.

Q.

Which of the following circles is a circle of triangular numbers?

1. 

2. 

3. 

4.