Answers

2015-06-30T08:43:49+05:30
Sum of odd number of odd numbers will give you an odd number not even  ie 3 numbers out the given odd numbers will be an odd number only.
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bt u have to prove this
[6/30, 09:19] Punit Bhaiya/M: (15+13-9)+(11+1-5)+(7-3)=(19)+(7)+(4)=30
[6/30, 09:19] Punit Bhaiya/M: According to BODMAS, bracket would be solved first and then the actual addition.
2015-06-30T08:54:46+05:30
See according to the rules & naturality of maths sum of odd numbers in odd times will be an odd number like you taking about 3 odd numbers to be added & the answer should be 30 so it is not possible because 30 is an even number.
 
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[6/30, 09:19] Punit Bhaiya/M: (15+13-9)+(11+1-5)+(7-3)=(19)+(7)+(4)=30
[6/30, 09:19] Punit Bhaiya/M: According to BODMAS, bracket would be solved first and then the actual addition.