Some probability question
1) given a rand5() function which provide a random number between 1-5 at equal probability. Write a rand7() fuction to provide a random number between 1-7 with equal probability...

Question

Some probability question 
1) given a rand5() function which provide a random number between 1-5 at equal probability. Write a rand7() fuction to provide a random number between 1-7 with equal probability...

Ambo · Accepted Answer

Abs(2*rand5()-3 )

Sigiloso · Answer

The answer Abs(2*rand5()-3 ) does not generate uniformly distributed random numbers. It is wrong!

Anonymous · Answer

int value = rand5() - 1 + (rand5() * 5);
if(value < 21) {
return (value%7 +1);
}

NN · Answer

int value = rand5()-1 + (rand5()-1)*5;
if (value < 21) {
return( value / 3 +1);
}

Sigiloso · Answer

int value=0
for (i=0; i<5; i++) {
value+=(rand5()-1);}
return (value%3+1);

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