Please help me with 3rd sum
correct answer is 1

Dear student,

Please find below the solution to the asked query:

Note that the number of ways of ticking the answers in any one attempt  is    24-1=15The student is taking chance at ticking the correct answer. It is reasonable toassume that in order to derive maximum benefit, the five solutions which hesubmit must be all different.So the total number of ways is given by,    n= 15C5Let m be the no. of ways in which the correct solution is excluded.Then we have,   m= 14C5Hence the required probability is,   p=1-14C515C5    =1-20023003    =3003-20023003    =10013003    =13Therefore the value of 3p is ,   3p= 3×13=1

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