Question
Simplity: $5 + (-5) + 5 + (-5) + .....$ When the number ol terms is $20.$
✓
Answer
When the number of terms is $20$
$5 + (-5) + 5 + (-5) + ..... = (5 + 5 + 5 + ..... 10$ terms$) + (-5 - 5 - 5 - ..... 10$ terms$) = 10 \times 5 + 10 \times (-5) = 50 - 50 = 0$
$5 + (-5) + 5 + (-5) + ..... = (5 + 5 + 5 + ..... 10$ terms$) + (-5 - 5 - 5 - ..... 10$ terms$) = 10 \times 5 + 10 \times (-5) = 50 - 50 = 0$
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