Question
Simplity: 5 + (-5) + 5 + (-5) + .....
When the number ol terms is 20.
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 × 5 + 10 × (-5)
= 50 - 50
= 0
5 + (-5) + 5 + (-5) + ..... = (5 + 5 + 5 + ..... 10 terms) + (-5 - 5 - 5 - ..... 10 terms)
= 10 × 5 + 10 × (-5)
= 50 - 50
= 0
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