11 + 18 + 25 + 32 .... ধারাটির 15 টি পদের সমষ্টি কত ?
Created: 4 years ago |
Updated: 1 year ago
best des
It is an arithmetic series.
We know,
Sn = n/2{2a + (n - 1)d}
S15 = 15/2{2x11 + (15 - 1)7} = 7.5{22 + 98} = 900
We know,
Sn = n/2{2a + (n - 1)d}
S15 = 15/2{2x11 + (15 - 1)7} = 7.5{22 + 98} = 900
Md Azizur Rahman
Founder of Satt
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