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1.Find the sum of the series -1+1+5+13+39+.....to n terms 2.If the ratio of the seventh term from the beginning and end in the binomial expansion (cube root of 2 +1/cube root of 3)^n is 1:6 , find n Thank you sir for your previous answer !

1.Find the sum of the series -1+1+5+13+39+.....to n terms
2.If the ratio of the seventh term from the beginning and end in the binomial expansion (cube root of 2 +1/cube root of 3)^n is 1:6 , find n
 
Thank you sir for your previous answer ! 

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1 Answers

Deepak Kumar Shringi
askIITians Faculty 4404 Points
6 years ago
Dear, in the first question it should be 29 in place of 39 for 2ndquestion go through attached image
562-1915_IMG-20180306-WA0014.jpg

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