Correct option is B
Given:
2(101)5
8(246)3
3(???)7
Logic : Middle number → (first number ×third number) and sum of digits of this product
2(101)5→ [(2 × 5) (1 + 0)] = (101)
8(246)3 → [(8 × 3) (2 + 4)] = (246)
Similarly,
3(???)7 → [(3 × 7) (2 + 1)] = (213)
Correct answer is (B).