Question

Manik comes across a number sequence, he spends some time on it and concludes that one of the numbers in the given series is incorrect. He then goes to Swapnil's house and asks him to find the incorrect number.
The number series is given below, can you help Swapnil find the incorrect number?

3601, 3602, 1803, 604, 154, 36, 12

• A. 3602
• B. 1803
• C. 604
• D. 154

Answer 1

The correct option is D 154

Once you have identified the pattern, solving the question becomes very simple.
Manik had a decent idea of identifying the pattern in the given number series, he then applied it to each and every number in the series to get the desired answer. The pattern Manik identified or applied is given below:
If you look closely at the given number of the pattern:

Each number in the pattern can be found with the following steps:
Step 1: Divide the given 4 digit number with the digit at the unit place.
Step 2: Add the same unit digit to the resultant number to get the next number in the pattern.
Let's do the math then.
$\frac{3601}{1}+1=3602$
$\frac{3602}{2}+2=1803$
$\frac{1803}{3}+3=604$
$\frac{604}{4}+4=155$
$\frac{155}{5}+5=36$
$\frac{36}{6}+6=12$

Thus, he concludes that 154 is written in place of 155.