Questions asked by Dean R.
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Please solve Q 27 - 31. Q27. #a_n=na_{n-1}, a_1=1, a_3=?# Q28. Convergence region of #y = 1+x/2 + x^2/4 + ...# Q29. #sum_{r=1}^20( 3r+1)# Q30. Which is a field? #N, Z, Q, M_{2 times 2}# Q31, Inverse of #omega# in #{ 1, omega, omega^2 }#