Multiple choice

In the following number series only one number is wrong. Find out the wrong number. $75 \quad 74 \quad 146 \quad 430 \quad 1736 \quad 8675$

  1. $75$
  2. $146$
  3. $430$
  4. $74$

  5. None of these
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C Correct answer
Explanation

The pattern is: x1-1, x2-2, x3-4, x4-8... Starting with 75: 75-1=74, 74x2=148, 148-2=146, 146x3=438 (not 430), 438-4=434, 434x4=1736, 1736-5=1731, 1731x5=8655. The number 430 breaks the pattern - it should be 438. The pattern multiplies by increasing integers (2,3,4,5...) then subtracts increasing integers (1,2,3,4...).

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