১ + ৫ + ৯ + ১৩..... ধারাটির ১৫তম পদ হবে-
Created: 2 months ago |
Updated: 2 months ago
best des
a = প্রথম পদ 1, d = সাধারণ অন্তর = 5 - 1 = 4, n = তম পদ 15
a + (n - 1)d
= 1 + (15 - 1)4
= 1 + 14*4
= 1 + 56
= 57
Ans: 57
এখানে,a=1,n=15,d=4
ধারাটির ১৫ তম পদ
= a + (n - 1)d
= 1 + ( 15 - 1) x 4
= 57
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