3 + 6 + 9 + 12 + .... ধারাটির 12 টি পদের যোগফল .....।
Created: 4 years ago |
Updated: 3 years ago
best des
3 + 6 + 9 + 12 + ....... সমান্তর ধারার প্রথম পদ
a = 3
সাধারণ অন্তর, d = 6 - 3 = 3
সমষ্টি = n/2 {2a + (n - 1)d}
= 12/2{2x3 + (12 - 1)3}
= 6(6 + 33)
= 6×39
= 234
Md Azizur Rahman
Founder of Satt
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