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U25 - U23 = 1/25 - 1/23
= (23 - 25) /(23 x 25)
= - 2/575
b.U25 - U23 = (-1)^25 - (-1)^23
= -1 - (-1)
= 0
c. Un = 1/(n-3)
U25 - u23 = 1/22 - 1/20
= (20-22) /(22x20)
= - 2/440
= -1/220
d.U25 = 25!/2^25 = 4,62 10^17
U23 = 23!/2^23 = 3,08 10^15
U25 - U23 = 4,59 .10^17