It takes 5 minutes to pass a rumor from one form one person to another person. The Tree of Rumour continues. How many persons would know the Rumour after 20 minutes?
- 16
- 27
- 81
- 90
Explanation
In the Tree of Rumour problem, one person passes the rumour to 2 other people every 5 minutes.
Therefore, the total number of people triples every 5 minutes.
0 minutes → 1 person
5 minutes → 3 persons
10 minutes → 9 persons
15 minutes → 27 persons
20 minutes → 81 persons
Using the formula:
3^20/5 =3^4 =81
Related MCQs
- 25%
- 30%
- 35%
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
ایک طالب علم معیاری ٹیسٹ میں 84 ویں فیصد پر ہے۔ اس کا سب سے زیادہ قابل دفاع مطلب کیا ہے؟
- About 84% of the reference group scored no higher
- The learner answered exactly 84% of the items correctly
- The learner's raw score is 84 points above the mean
- Exactly 84% of all test items were easier for the learner
اس سوال کو وضاحت کے ساتھ پڑھیں
