1+3+5+ -------+ 2x-1 কত?

A    x(x-1)

B    x(x+1)/2

C    x(x+1)

D    x2

Solution

Correct Answer: Option D

 

পদসংখ্যা= [{(2x-1)-1}/(3-1)]+1

           =x

আমরা জানি, সমষ্টি = [(১ম পদ + শেষ পদ)/২] x পদসংখ্যা

সুতরাং সমষ্টি ={(1+2x-1)/2}x x

               = x2

Practice More Questions on Our App!

Download our app for free and access thousands of MCQ questions with detailed solutions