For a first order parallel reaction A → C + D where A \to^{k_1} , A \to^{k_2} D at any time

Correct Answer is : [D] = k1[A]0k1+k2 (1−e−(k1+k2)t)

[D] = \frac{k_1[A]_0}{k_1+k_2} (1-e^{-(k_1+k_2)t})