In a survey of 240 people, It was found that 130 of people like tea,120 of people like coffee while 40 do not like both tea and coffee .by drawing Venn diagram, find the number of people who like both tea and cofee​

the number of people who like both tea and cofee is 50

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent