Compute the value of summation using the composition of set.

Question

Q. If \(\phi =\scriptsize{\brace{ \psi_i : \psi_i =\frac{\sum_{\eta=i}^{15}}{2}=\beta\: \& \:\beta ,i \:\in N \:, \:i≤10 }}\), then compute \(\sum\alpha_o\) , where \(\alpha_o \in \phi\)ath widget