Question

1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9 times 0

Answer 1

Step-by-step explanation:

1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9 times 0

2(1+2+3+4+5+6+7+8+9)times 0

Here n = 9

Sum of n natural numbers is given as:

$2 \times \frac{n(n + 1)}{2} \times 0 \\ \\ = 2 \times \frac{9 \times 10}{2} \\ \\ = 9 \times 10 \times 0 \\ \\ = 90 \times 0 \\ \\ = 0$

Answer 2

0, because anything multiplied by 0 is 0.