P1 is the average of all prime numbers below 12. P2 is the average of all prime numbers between 12 and 30. What is the value of 5P1 – P2?
Answer & explanation
Correct answer: option 1
2,3,5,7,11 13,17,19,23,29
Average \(\frac{28}{5}\) \(\frac{101}{5}\)
Now, 5P1 P2
\(\frac{5 × 28}{5}\) \(\frac{101}{5}\)
Hence,
5P1 – P2= 28 - 20.2 =7.8