Recent content by mna skt

i have solved that question but could anybody please tell me some thing about how to grade the concept and some thing about tensor in more easy way

the number of hairs Nsub.1 on a certain rare species can only be the number 2sup.l(l=0,1,2...) The probability of finding such an animal with 2sup.l hairs is exp-1/l ! what is the expectation,<N>? what is deltaN?