Background: willingness to pay for routine immunization services is the maximum amount a household or individual hypothetically prepared give up benefit from services. Determining monetary value of given healthcare such as vaccinations create challenges health policymakers, particularly in developing countries. Objective: determine residents urban areas Kano State are willing and its associated...

For every 1 ≤ i ≤ n, let Ti be a rooted star with root vi, where vi is not necessary to be its center. Then the union F = T1 ∪T2 ∪ . . .∪ Tn is called a rooted star forest with roots v1, v2, . . . , vn. Let P be a set of |F | points in the plane in general position containing n specified points p1, p2, . . . , pn, where |F | denotes the order of F . Then we show that there exists a bijection φ ...