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What should come in place of the question mark (?) in the following sequence?
324, 270, ?, 187.5, 156.25
  • a)
    240
  • b)
    254
  • c)
    225
  • d)
    195
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
What should come in place of the question mark (?) in the following se...
Pattern:
To find the missing number in the sequence, we need to identify the pattern followed by the given numbers.

Explanation:
The given sequence is: 324, 270, ?, 187.5, 156.25

To find the pattern, let's analyze the difference between consecutive terms:

- The difference between 324 and 270 is 54.
- The difference between 270 and the missing term is x.
- The difference between the missing term and 187.5 is 156.25 - 187.5 = -31.25.

Observations:
- The difference between the first two terms is positive.
- The difference between the last two terms is negative.

Pattern Analysis:
Based on the above observations, we can conclude that the differences between consecutive terms alternate between positive and negative values.

Calculating the Missing Term:
To find the missing term, we need to determine the value of x, which is the difference between the second and third terms.

- The difference between the first two terms is 54.
- The difference between the missing term and 270 is -54 (negative value because it is the alternate difference).
- The difference between the missing term and 187.5 is -31.25.

Hence, we can set up the equation:
(270 - x) - 31.25 = 187.5

Simplifying the equation:
270 - x - 31.25 = 187.5
238.75 - x = 187.5
-x = 187.5 - 238.75
-x = -51.25
x = 51.25

Calculating the Missing Term:
Now that we have determined the value of x, we can find the missing term by subtracting x from 270.

Missing term = 270 - x
Missing term = 270 - 51.25
Missing term = 218.75

Conclusion:
The missing term in the given sequence is 218.75. Therefore, the correct answer is option C) 225.
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