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प्रश्न
Out of 400 bulbs in a box, 15 bulbs are defective. One bulb is taken out at random from the box. Find the probability that the drawn bulb is not defective.
योग
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उत्तर
Given: Out of 400 bulbs, 15 are defective; one bulb is drawn at random.
Step-wise calculation:
1. Number of non‑defective bulbs
= 400 – 15
= 385
2. Probability (not defective) = `"Favourable"/"Total"`
= `385/400`
3. Simplify: `385/400`
= `77/80`
= 0.9625
= 96.25%.
The probability that the drawn bulb is not defective is `77/80` (≈ 0.9625 or 96.25%).
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