alleryজলের স্তর প্রতিদিন হ্রাস পেয়ে 100, 90, 80, 70 cm হয়। পরবর্তী স্তরটির পূর্বাভাস দিন।
A60
B65
C50
D40
Answer & Solution
Correct answer: A. 60
শ্রেণিটি প্রতিটি ধাপে 10 করে হ্রাস পায়, সুতরাং 70 - 10 = 60।
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