In India the number of females per thousands males had been constantly decreasing but in which of the following years, the number had been increased
In India the number of females per thousands males had been constantly decreasing but in which of the following years, the number had been increased
- A
$1971-1981$
- B
$1981-1991$
- C
$1951-1961$
- D
$1961-1971$
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