Answer the following question using the appropriate counting technique, which may be either arrangement with repetition, permutations, or combinations. be sure to explain why this counting technique applies to the problem.
how many possible birth orders with respect to gender are possible in a family with five children? (for example, bbbgg and bgbggbbbgg and bgbgg are different orders.)

a. permutations because the selections come from a single group of items, no item can be selected more than once and the order of the arrangement matters.
b. arrangements with repetitions because there are r selections from a group of n choices and choices can be repeated.
c. combinations because the selections come from a single group of items, no item can be selected more than once, and the order of the arrangement does not matter.
d. arrangements with repetitions because the selections come from a single group of items, and the order of the arrangement matters.