Directions (61-65) : Find the wrong number in following number series.

5 , 43 , 70 , 88 , 99 , 104, 108

The correct answer is Option 104.

To find the wrong number in the given number series, let us analyze the pattern of differences between consecutive terms:

$43-5=38$

$70-43=27$

$88-70=18$

$99-88=11$

Now, let us examine the differences between these consecutive differences (the second difference):

$38-27=11$

$27-18=9$

$18-11=7$

We can observe a clear pattern in the second differences: they are decreasing odd numbers (11, 9, 7, ...).
Following this pattern, the next second difference should be 5, and the next should be 3.

Let us recalculate the expected differences between consecutive terms using this pattern:

1. The difference after 11 should be:
$11-5=6$

Adding 6 to 99 gives the correct term:
$99+6=105$

2. The next difference after 6 should be:
$6-3=3$

Adding 3 to 105 gives the last term in the series:
$105+3=108$

Thus, 104 is incorrect and should be replaced by 105 to follow the series pattern.