Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2019-10-17 21:28:22

seercalf
Member
From: Kenya
Registered: 2019-10-13
Posts: 17

Probability and Statistics

10 cards are numbered from 1 to 10 and placed in a box. One card is selected at random and is not replaced. Another card is then randomly selected. What is the probability of selecting two prime numbers?


Trust in God and do the right!

Trust in the Lord with all your heart and lean not on your own understanding; in all your ways submit to him, and he will make your paths straight. (Proverbs 3 : 5-6)

Offline

#2 2019-10-17 23:42:32

Relentless
Member
Registered: 2015-12-15
Posts: 625

Re: Probability and Statistics

There are 9*10=90 possible combinations. There are 3*4=12 possible prime number combinations: (2,3), (2,5), (2,7), (3,2), (3,5), (3,7), (5,2), (5,3), (5,7), (7,2), (7,3), (7,5). The probability is 12/90=2/15.

Last edited by Relentless (2019-10-17 23:46:17)

Offline

Board footer

Powered by FluxBB