In the expansion of (x+y)^n, the …
CBSE, JEE, NEET, CUET
Question Bank, Mock Tests, Exam Papers
NCERT Solutions, Sample Papers, Notes, Videos
Posted by Sivamitha Sivmit 6 years, 3 months ago
- 1 answers
Test
Related Questions
Posted by Ashish Chaudhary 1 year, 4 months ago
- 1 answers
Posted by Ananya Sv 1 year, 4 months ago
- 1 answers
Posted by Sabin Sultana 1 year, 4 months ago
- 0 answers
Posted by Manoj Thakur 1 year, 4 months ago
- 0 answers
Posted by Nitin Kumar 1 year, 4 months ago
- 1 answers
Posted by Sethpoulou Apoulou 1 year, 5 months ago
- 0 answers
Posted by Gurleen Kaur 1 year, 4 months ago
- 0 answers
Posted by Sana Dharwad 1 year, 4 months ago
- 0 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Sia ? 6 years, 3 months ago
In the expansion of (x + y)n,
T4 = T3+1 = nC3xn-3 {tex}\times{/tex} y3
and T13 = T12+1 = nC12xn-12 {tex}\times{/tex} y12
We are given that coefficients of 4th and 13th terms are equal.
{tex}\therefore{/tex} nC3 = nC12
{tex}\Rightarrow{/tex} nC3 = nCn-12 [{tex}\because{/tex} nCr = nCn-r]
{tex}\therefore{/tex} n - 12 = 3 {tex}\Rightarrow{/tex} n = 15
2Thank You