কোনো ধারার n তম পদ n. হলে ধারাটির প্রথম পাঁচটি পদের যোগফল কত?
Created: 5 years ago |
Updated: 3 years ago
best des
n তম পদ = n.2n - 1
১ম পদ = 1.21 - 1 = 1 × 1 = 1
২য় পদ = 2.22 - 1 = 2 × 2 = 4
৩য় পদ = 3.33 - 1 = 3× 4 = 12
৪র্থ পদ = 4.44 - 1 = 4 × 8 = 32
৫ম পদ = 5. 5 5 - 1 = 5 × 16 = 80
সমষ্টি = 1 + 4 + 12 + 32 + 80 = 129
Md Azizur Rahman
Founder of Satt
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