)r ‌=‌11Cr2‌11−2rx22−3r ‌22−3r=10‌‌‌ and ‌‌‌22−3r=7 ‌r=4‌‌‌ and ‌‌‌r=5 ‌‌ Coefficient of ‌x10=‌11C4⋅23 ‌‌ Coefficient of ‌x7=‌11C5⋅21 ‌‌ difference ‌=‌11C4⋅23−‌11C5⋅2 ‌=‌