alleryবর্গের ক্রমযোজিত যোগফল থেকে পাওয়া যায় 1, 5, 14, 30, 55। পরবর্তী যোগফলটি কত?
A96
B90
C85
D91
Answer & Solution
Correct answer: D. 91
পার্থক্যগুলি হলো পূর্ণবর্গ সংখ্যা 4, 9, 16, 25; সুতরাং পরবর্তী পার্থক্যটি হলো 36 এবং 55 + 36 = 91।
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