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General Medicine General 76134910

A contraceptive "X" is used by 100 couples for continuous period of 2 years. During this period 20 women become pregnant despite using contraceptive "X". What is the pearl index of contraceptive "X"?

A
0.1 per HWY
B
1 per HWY
C
10 per HWY
D
1000 per HWY

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