Questions asked by Dean R.

Questions asked by Dean R.

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Please solve Q 27 - 31. Q27. $a_{n} = n a_{n - 1}, a_{1} = 1, a_{3} = ?$ $a_n=na_{n-1}, a_1=1, a_3=?$ 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 ${ 1, omega, omega^2 }$