Question five coefficient ?
1 Answer
Jan 20, 2018
Explanation:
#(a+b)^n=sum_(r=0)^na^(n-r)b^r#
#•color(white)(x)T_(r+1)=^nC_ra^(n-r)b^r#
#"here "a=1/5x,b=-25y" and "r=5#
#rArr ^(11)C_5(1/5x)^(11-5)(-25y)^5#
#=462xx1/15625x^6xx-9765625y^5#
#"coefficient "=462xx(-9765625)/15625#
#color(white)("coefficient ")=-288750#