11th Class
Mathematics
Sample Paper
Maths Olympiad Model Paper-1
question_answer
Let \[S={{C}_{1}}-\left( 1+\frac{1}{2} \right)\,\,{{C}_{2}}+\left( 1+\frac{1}{2}+\frac{1}{3} \right)\,\,{{C}_{3}}-....+\] \[{{(-1)}^{n-1}}\left( 1+\frac{1}{2}....+\frac{1}{n} \right){{c}_{n}},\] then