allery7 : 56 :: 9 : ?
A63
B72
C81
D90
Answer & Solution
Correct answer: D. 90
প্যাটাৰ্ন: n² + n (বা n × (n+1))। 7² + 7 = 49 + 7 = 56 ✓। 9² + 9 = 81 + 9 = 90।
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