1+3+5+. . . . . . .+31 = কত ?
A 234
B 256
C 324
D 342
Correct Answer: Option B
পদসংখ্যা = \(\frac{{30}}{2} + 1 = 16\) যোগফল = \(\frac{{(1 + 31) \times 16}}{2} = 256\)
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