Question

pls answer this question

Answer 1

Question:-

F7. Observe the following 1 + 2 - 3 + 4 + 5 - 6 - 7 + 8 - 9 =-5. change one '-' sign as '+'sign to get the sum 9.

Required Answer ✏

if we change -7 into +7 then the sum =

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

checking whether the answer is coming or not--

3 - 3+ 4 + 5 - 6 + 7 + 8 - 9 = 9

0 + 9 + 1 - 1 = 9

9 = 9

proved

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