True or false
1.the number of permutations of r objects out of n (r > 1), is greater than the number of combinations of r objects out of n.

True

Step-by-step explanation:

Permutation is act of arranging members of a set while combination is selection of the items from collection.

The number of permutation of r object out of n is:

The number of combinations of r object out of n is:

Or,  

So, number of the permutations of r objects out of n is greater than number of the combinations of r objects out of n.

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

$320 to $405

step by step explanation:

in one day he earns between $64 and $81

therefore if he works for 5 days, he will earn between 64 x 5 to 81 x 5

= $320 to $405