Mohon bantuanya nomor 13-15

jika bingung mohon dm saya

13). E
[tex]5 \binom{2}{ - 4} - 3 \binom{3}{ - 5} + 2 \binom{1}{3} \\ = \binom{10}{ - 20} - \binom{9}{ - 15} + \binom{2}{6} \\ = \binom{10 - 9 + 2}{ - 20 + 15 + 6} \\ = \binom{3}{1} [/tex]

14). C
[tex]ab = b - a \\ = \binom{ - 5}{2} - \binom{3}{7} \\ = \binom{ - 8}{ - 5} [/tex]

15). B
[tex]pq = q - p \\ = \binom{ - 5}{3} - \binom{3}{ - 7} \\ = \binom{ - 8}{10} \\ \\ \frac{1}{2} pq = \frac{1}{2} \binom{ - 8}{10} \\ = \binom{ - 4}{5} [/tex]