Prove this identity between two infinite sums (with x ∈ R and n! stands for factorial): X∞
n=0
x
n
n!
!2
=
X∞
n=0
(2x)
n
n!

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.