Question

find the common difference

Answer 1

Puttin n=1
a1=5-11*1
   =5-11
   = -6
Puttin n=2
a2=5-11*2
   =5-22
   = -17
d= a2-a1
  = -17-(-6)
  = -17+6
  = -11

Answer 2

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