7, 4, 5, 9, ?, 52.5Question 14Answera.21b.18c.29.5d.20

To solve this problem, we need to identify the pattern or rule that the sequence follows.

Looking at the sequence: 7, 4, 5, 9, ?, 52.5

We can see that the sequence doesn't increase or decrease consistently. So, let's try to find a pattern by looking at the differences between the numbers:

4 - 7 = -3 5 - 4 = 1 9 - 5 = 4

There doesn't seem to be a clear pattern here. So, let's try looking at the ratios between the numbers:

4 / 7 = 0.57 (approx) 5 / 4 = 1.25 9 / 5 = 1.8 (approx)

Again, there doesn't seem to be a clear pattern.

However, if we look at the multiplication factor between the numbers, we can see a pattern:

4 is approximately 0.57 times 7 5 is 1.25 times 4 9 is 1.8 times 5

If we continue this pattern, the next number should be approximately 2.33 times 9.

So, the missing number in the sequence is 9 * 2.33 = 20.97 (approx)

Therefore, the closest answer is:

d. 20