(A) The pattern followed in the series is $x_{n+1} = 2 \times x_n + n$,where $n$ is the position index starting from $1$.$9 = 2 \times 4 + 1$$20 = 2 \

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(A) The pattern followed in the series is $x_{n+1} = 2 \times x_n + n$,where $n$ is the position index starting from $1$.$9 = 2 \times 4 + 1$$20 = 2 \times 9 + 2$$43 = 2 \times 20 + 3$$90 = 2 \times 43 + 4$Following this pattern,the next term is:$? = 2 \times 90 + 5 = 180 + 5 = 185$