If the coefficient of the rth and (2r + 5) th terms of the expansion of (1 + x)^ 15 are equal, r =

Question

anonymous · Answer

co·ef·fi·cient [k i físh'nt]
(plural co·ef·fi·cients) 
noun 
1.  numerical part of algebraic term: the number placed before a letter that represents a variable in algebra, e.g. the "3" of "3x" in the equation "3x = 6" 
2.  figure measuring property of substance: a numerical constant that is a measure of a property of a substance

hartnn · Answer

use binomial expansion general formula

hartnn · Answer

where n=15, r=r, a=1,b=x

anonymous · Answer

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