Step 1 :The total number of marbles in the bag is calculated as \(6 (red) + 2 (blue) + 7 (green) = 15 (total marbles)\).
Step 2 :The probability of drawing a red marble on the first draw is calculated as \(\frac{6 (red marbles)}{15 (total marbles)} = 0.4\).
Step 3 :After drawing one red marble, there are now 5 red marbles left and a total of 14 marbles in the bag.
Step 4 :The probability of drawing a red marble on the second draw is calculated as \(\frac{5 (red marbles)}{14 (total marbles)} = approximately 0.357\).
Step 5 :The probability of both events happening (drawing a red marble on the first draw and drawing a red marble on the second draw) is found by multiplying the probabilities of each event.
Step 6 :So, the probability of drawing two red marbles in a row is calculated as \(0.4 * 0.357 = approximately 0.143\).
Step 7 :\(\boxed{0.143}\) is the final answer to the nearest thousandth.