Which number will fit in '?' place in the following series ? 12,23,45,89,?

Options

A. 175
B. 176
C. 177
D. 178

Answer

To solve the problem of finding the number that fits in the '?' place in the series 12, 23, 45, 89, we can analyze the pattern in the series step by step.

**Step 1: Identify the pattern**
Let's look at the first two numbers in the series:
- 12 to 23.
We can see that 12 multiplied by 2 gives us 24, and then we subtract 1 to get 23.

**Step 2: Apply the same logic to the next number**
Now let's apply the same operation to 23:
- 23 multiplied by 2 gives us 46, and then we subtract 1 to get 45.

**Step 3: Continue the pattern**
Next, we apply the same operation to 45:
- 45 multiplied by 2 gives us 90, and then we subtract 1 to get 89.

**Step 4: Find the next number**
Now, let's find the next number in the series using the same operation on 89:
- 89 multiplied by 2 gives us 178, and then we subtract 1 to find the next number in the series.

**Step 5: Calculate the final result**
178 - 1 = 177.

Thus, the number that fits in the '?' place in the series is **177**.

**Final Answer: 177**

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