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

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

A.

328

B.

84

C.

164

D.

44

Correct option is A

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:
A — 328 is the wrong number

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