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Question

If 3 $ 4 = 37 and 4 $ 5 = 61, what is 5 $ 6?

This question was previously asked in
SSC CGL 2025 Tier 2 Paper 1 Question Paper (19-Jan-2026)
The correct answer is
91

3 $ 4 Pattern Analysis

The problem defines a mathematical operation '$' using the following examples:

3 $ 4 = 37

4 $ 5 = 61

We need to find the value of 5 $ 6 by identifying the common pattern.

Rule Derivation

Observe that each result can be obtained using:

[
a $ b = a2 + b2 + (a × b)
]

Let's verify the pattern with the given examples.

For 3 $ 4:

[
32 + 42 + (3 × 4)
]

[
= 9 + 16 + 12
]

[
= 37
]

So, the pattern correctly gives:

[
3 $ 4 = 37
]

For 4 $ 5:

[
42 + 52 + (4 × 5)
]

[
= 16 + 25 + 20
]

[
= 61
]

So, the pattern also correctly gives:

[
4 $ 5 = 61
]

Therefore, the rule is:

[
a $ b = a2 + b2 + ab
]

5 $ 6 Calculation

Now apply the same rule for (5 $ 6):

[
5 $ 6 = 52 + 62 + (5 × 6)
]

[
= 25 + 36 + 30
]

[
= 91
]

Therefore:

[
5 $ 6 = 91
]

Final Answer

Option 4: 91

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