CBSE2026Class Class 10 · Mathematics1 Marks · Mcq✅ Verified
$(3 \times 11 \times 13 + 3)$ is :
A. a prime number
B. divisible by 13
C. a composite number
D. an odd number
✅ Answer & Solution
✅ Correct Answer: C
Step 1: Simplify the expression.
$$3 \times 11 \times 13 + 3 = 3(11 \times 13 + 1) = 3(143 + 1) = 3 \times 144 = 432$$
Step 2: Since $432 = 3 \times 144$, it has factors other than $1$ and itself.
Step 3: Therefore it is a composite number (it is also even, and $432$ is not divisible by $13$).
