If `3xx4=10,5xx8=18,7xx7=?`

यदि `3xx4=10, 5xx8=18`, हो, तो `7xx7=?`

Options

A. 26
B. 21
C. 28
D. 49

Explanation

To solve the problem, we need to identify the pattern in the given equations:

1. **Equation 1:** \(3 \times 4 = 10\)
2. **Equation 2:** \(5 \times 8 = 18\)
3. **We need to find:** \(7 \times 7 = ?\)

### Step-by-Step Solution:

**Step 1:** Analyze the first equation \(3 \times 4 = 10\).

- If we multiply \(3\) by \(2\), we get \(6\).
- Then, if we add \(4\) to \(6\), we get \(10\).

So, the pattern can be described as:
\[ (a \times 2) + b = c \]
Where \(a\) is the first number, \(b\) is the second number, and \(c\) is the result.

**Step 2:** Analyze the second equation \(5 \times 8 = 18\).

- If we multiply \(5\) by \(2\), we get \(10\).
- Then, if we add \(8\) to \(10\), we get \(18\).

This confirms the same pattern:
\[ (5 \times 2) + 8 = 18 \]

**Step 3:** Apply the same pattern to the third equation \(7 \times 7\).

- Multiply \(7\) by \(2\):
\[ 7 \times 2 = 14 \]
- Now add \(7\) to \(14\):
\[ 14 + 7 = 21 \]

Thus, we find:
\[ 7 \times 7 = 21 \]

### Final Answer:
Therefore, \(7 \times 7 = 21\).

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