MCQ practice · SSC General Mathematics Board questions · Chapter 3: Algebraic Expressions
What is 4ab?
Think it through first, then pick an option.
- a 2
- b 5
- c 8
- d 10
Answer and explanation
Correct answer: a 2
4ab = (a + b)² − (a − b)² = 6 − 4 = 2.
Why the other options are wrong
- b 5: 5 is a² + b²; the question asks for 4ab, which needs a subtraction.
- c 8: 8 comes from multiplying 2 by 4 again; 4ab itself is already 2, not ab.
- d 10: 10 is 6 + 4, the sum; 4ab needs the difference.
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