Mathematics · 2021
JEE Main · 31 August 2021, Shift 1 · Q88
An electric instrument consists of two units. Each unit must function independently for the instrument to operate. The probability that the first…
An electric instrument consists of two units. Each unit must function independently for the instrument to operate. The probability that the first unit functions is $\displaystyle 0.9$ and that of the second unit is 0.8. The instrument is switched on and it fails to operate. If the probability that only the first unit failed and second unit is functioning is p, then $\displaystyle 98$ p is equal to
\_\_\_\_.
Official answer
28
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JEE Main 2021 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.