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Grade 11Engineering Entrance Exams

Find the sum of all rational terms in the expansion (31/5+21/3)15

Profile image of Adithya sivasankar
10 Years agoGrade 11
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2 Answers

Profile image of Sourabh Singh
10 Years ago
Use binomial expansion in order to get the terms which will be rational in nature.
nCrarbn-r
you will get answers when
r= 0,15.
Just these two values and you are through with the answer
Profile image of Rishabh Gupta
8 Years ago
After getting r=0,15, find Tr+1 term and put r=0 and r=15. So you will get 1st and last term, now add both these term, After adding you will get sum = 59.

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