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प्रश्न
A student passes an examination if he/she secures a minimum in each of the 7 subjects. Find the number of ways a student can fail.
उत्तर
Every subject a student may pass or fail.
∴ Total number of outcomes = 27 = 128
This number includes one case when the student passes in all subjects.
Required number = 128 – 1 = 127
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