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How is sex ratio measured?...

How is sex ratio measured?

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Sex ratio in the world is calculated a number of males per thousand of females in a population
Sex ratin =(No. of males) /(No. of females) `xx 1000`
In countries like India sex ratio is calculated as of females per thousands of males.
Sex ratio =(No. of females)/(No. of males) `xx 1000`
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