a = 4 (369) 9, b = 6 (246) 4, c = 9 (?) 5
Explanation:
4 × 9 = 36 ; 3 + 6 = 9 ⇒ 369 6 × 4 = 24; 2 + 4 = 6 ⇒ 246
⇒ 9 × 5 = 45; 4 + 5 = 9 ⇒ 459
Hence, option (a).
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