Question

5 3
If - 2n-=-n, the value of nis
6 4
3
2 5
a) b)
d)
2
5
4
c)
(
)
1​

Answer 1

Answer:

n

C

r

=

4

3

n−r

r+1

=

4

3

n

C

r+2

n

C

r+1

=

5

4

n−r−1

r+2

=

5

4

Onsolvingabovewegetr=26,n=62

2n+3r=238

n

C

r+1

n

C

r

=

4

3

n−r

r+1

=

4

3

n

C

r+2

n

C

r+1

=

5

4

n−r−1

r+2

=

5

4

Onsolvingabovewegetr=26,n=62

2n+3r=238

Answer 2

Answer:

2nd Term =

n

C

1

(a

1/13

)

(n−1)

(

a−1

a

)

1

=14a

5/2

⇒na

13

n−1

.a

3/2

=14a

5/2

⇒ Comparing both sides

⇒

13

n−1

+

2

3

=

2

5

⇒

13

n−1

=1⇒n−1=13

⇒n=14

n

C

2

n

C

3

⇒

2!(n−2)!

n!

3!(n−3)!

n!

=

n!3!(n−3)!

2!(n−2)!n!

⇒

3!11!

2!12!

=

3

12

=4

Step-by-step explanation:

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