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Grade: 11

                        

If in the expansion of (1+x)^32, the coefficient of (3r+1)th term be equal to the coefficient of (r+5)th term, show that, r=7.

3 years ago

Answers : (1)

Arun
24742 Points
							
Just find 3r+1 term and r+5 term
and make them equal
32C3r = 32Cr+4
Now use formula and use will get 
r= 7
Hope it helps
3 years ago
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