In the following number series, one term is wrong. Find the wrong term. 5, 10,…

In a number series with an alternating-multiplier pattern, each term is obtained by multiplying the previous term by one of two fixed multipliers used in a repeating sequence (for example ×2, ×4, ×2, ×4, ...). To find the wrong term, apply the multipliers in order starting from the first term and identify where the given series deviates from the expected value.

1. 5 × 2 = 10, which matches the given second term.

2. 10 × 4 = 40, which matches the given third term.

3. 40 × 2 = 80, which matches the given fourth term.

4. 80 × 4 = 320, which matches the given fifth term.

5. 320 × 2 = 640 is the expected sixth term, but the given series shows 550 instead.

6. 640 × 4 = 2560, which matches the given seventh term.

Every other term in the series fits the ×2/×4 alternation exactly, and replacing 550 with the expected value 640 also correctly produces the next term (640 × 4 = 2560), confirming the deviation is isolated to that one term.

Hence, the wrong term in the series is 550.