alleryতিনটি সংখ্যা 10, x, 30 সমান্তর প্রগতিতে রয়েছে। x কত?
A15
B25
C22
D20
Answer & Solution
Correct answer: D. 20
সমান্তর প্রগতিতে থাকা তিনটি পদের মধ্যবর্তী পদটি হল বাইরের দুটির গড়, (10 + 30) / 2 = 20।
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