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হোম›নবম-দশম শ্রেণি›English Version›Mathematics›Finite Series›C-13-Q082

C-13-Q082mediumsingle_mcq

Rashid's total deposit in the first $18$ months is (Tk.) —

a $36900$
b $35100$
c $42000$
d $32400$

ব্যাখ্যা

Using the arithmetic series sum $S_n = \frac{n}{2}[2a+(n-1)d]$ , we get $S_{18} = \frac{18}{2}[2\times1200 + 17\times100] = 9\times4100 = 36900$ Tk.

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Finite Series — সব প্রশ্ন দেখুন (160টি) →