allery2, ?, 12, 20, 30-এর মধ্যে একটি মান লুকানো রয়েছে। লুকানো সংখ্যাটি কী?
A6
B8
C4
D10
Answer & Solution
Correct answer: A. 6
পদগুলি n x (n + 1) অনুসরণ করে: 1x2, 2x3, 3x4, 4x5, 5x6, তাই দ্বিতীয় পদটি হল 6।
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