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Grade: 11

                        

Show that: C 0 - C 1 (1+x / 1+nx) + C 2 [1+2x / (1+nx) 2 ] - C 3 [1+3x / (1+nx) 3 ] + ……..= 0 Find the sum of the series: ∑ (-1) r . n C r (1/2 r + 3 r /2 2r + 7 r /2 3r + …… + up to m terms ) r goes from 0 to n.

11 years ago

Answers : (1)

Askiitians Academic Expert
8 Points
							

Dear Prathamesh,

In order to get the sum of the series you have to provide the first three terms , then only one can understand what is the nature of the series. For e.g, if I give a series as follows,

2 , 4 , .......................................................... till nth term

Now can you tell me is it in G.P or A.P or A.G.P or H.P

Ofcourse not! So this is the problem in the question:

8/5 + 16/65 + ..................................+ 128/218 + 1 .

11 years ago
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