allery5, 10, 15, 20 পার্থক্যের সাহায্যে 6, 11, 21, 36, 56 গঠিত হয়েছে। পরবর্তী সংখ্যাটি কোনটি?
A76
B86
C81
D80
Answer & Solution
Correct answer: C. 81
পার্থক্যগুলি হলো 5, 10, 15, 20, সুতরাং পরবর্তী পার্থক্যটি হলো 25 এবং 56 + 25 = 81।
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