Find out the wrong number in a given series:
644, 328, 164, 84, 44, 24, 14...

Logic: Add increasing multiples of 10:

14 + 10 = 24

24 + 20 = 44

44 + 40 = 84

84 + 80 = 164

164 + 160 = 324

324 + 320 = 644

So correct series (reverse) should be:

14, 24, 44, 84, 164, 324, 644

But given series has:
644, 328, 164, 84, 44, 24, 14

Instead of 324, it has 328

Final Answer: