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Testing for a disease can be made more efficient by combining samples, the samples from four people are combined and the mixt
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Answer #1

Answer)

Answer)

Here we need to use the binomial formula

P(r) = ncr*(p^r)*(1-p)^n-r

Ncr = n!/(r!*(n-r)!)

N! = N*n-1*n-2*n-3*n-4*n-5........till 1

For example 5! = 5*4*3*2*1

Special case is 0! = 1

P = probability of single trial = 0.1

N = number of trials = 4

R = desired success = atleast 1

After substitution

Required probability is = p(1) + p(2) + p(3) + p(4)

Or we know that sum of all the probabilities is = 1

So p(atleast 1) = 1 - p(0)

= 0.3439

= 0.344

As the probability is not low

Option A is correct

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