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Tram

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A group of n professionals sit at a table at a conference. Before the presentation begins, they all put their cellular phones
1. 4 answers
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a saleperson earn 400$ per week plus 4% commission on sales that week. What dollar value of sales in the week person must have
1. 1 answer
2. 605 views
one of the main battery of cannons protecting the entrance to San Francisco Bay were able t horizontally propel 7.3 kg cannon
1. 3 answers
2. 588 views

Thank you very much fot the hint. So, if I am not wrong, there are (p*(n-1)+1) phones in the basket. The result is 1/(p*(n-1)+1). Now am I right? Thanks
Thanks, so if there are p*n white phones and the phone that she picked was white. It means that it was one of the p*n phones. So the results is 1/(p*n) Am I right?
I got it , thank you !
Where is 4.9 come from?
D=M/V so you have Mass: 77g and volume : 36 mL => D = 77/36 =2.1 g/mL

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