Question

observe the following : 1+2-3+4-5-6-7+8-9​

Answer 1

Answer:

-15

Step-by-step explanation:

1 + 2 - 3 + 4 - 5 - 6 - 7 + 8 - 9

= (1 + 2 + 4 + 8) -(3 + 5 + 6 + 7 + 9)

= 15 - 30

= - 15

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Answer 2

1+2-3+4-5-6-7+8-9

=> (1+2+4+8) - (3+5+6+7+9)

=> 15 - 30

=> -15