Question

1+2
$1$
$1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 9 + 8 + 7 + 4 + 6 + 5 + 3 + 2 + 1 + 0 +$
​

Answer 1

Answer:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 9 + 8 + 7 + 4 + 6 + 5 + 3 + 2 + 1 + 0 ==>90

Answer 2

Answer:

1+2+3+4+5+6+7+8+9+9+8+7+6+5+4+3+2+1=90

Step-by-step explanation:

1+To+9=45 and

1+To+9=45

45+45=90

Here the answer = 90