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the common difference of an arithmetic sequence is -1 and its 4th term is 7. And the 11th term?
Given that d = -1
7th term is 4 means a + (4 - 1)d = 7
ie, a  + 3* -1 = 7
  a = 7 + 3 = 10
So 11th term = a + 10d  
                     = 10 +10 * -1
                    = 10 - 10 = 0(since nth term of an AP with first term a and common differenced  is an = a + (n - 1) d)


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