Same Calculation giving different answer in different device

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I wonder if i try this calculation on scientific calculator, i am getting 6/2(2+1) = 1

and in mobile device, online and normal calculators it gives me,

6/2(2+1) = 9

from my knowledge and what i get taught, first one (answer = 1) was correct... but how normal calculator provide this? i am confused. please clarify..

i searched about this, found something called BODMAS rule was the reason for first one.. is it correct or anything else?

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