Answer:
24
Step-by-step explanation:
if we observe carefully we can see that the difference in the number of dots from the first picture to the second picture is 5
and the difference in the number of dots from the second picture to the third picture is 7
so there might be a chance that the difference between the 3rd figure and 4th figure may be 9
so my answer is the number of dots in the 3rd picture + 9
15+9= 24
