Question

Find the sum of all the integers between -5 and -1

Answer 1

Answer:

-5 + (-4) + (-3) + (-2) + (-1)

= -5-4-3-2-1 = -15

This is including -5 and -1

Ans. without including them is -9

Answer 2

Answer:

Sum of all integers 'from' -5 to -1 is :

( - 5) + ( - 4)  + ( - 3) + ( - 2) + ( - 1)

- 5 - 4 - 3 - 2 - 1   (∵ + × - = -)

-15

Sum of all integers 'between' - 5 to -1 is:

(- 4) + ( - 3) + ( - 2)

⇒ - 4 - 3 - 2 ( ∵ + × - = -)

⇒ - 9

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