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Rohit Jha

Jul 15, 2014

Sin 10 Sin 30 Sin 50 sin 70 = 1/16

This answer has an image. Please click on the question to read more.

Answer (5)

Umakant Biswal

Feb 21, 2015

If the sum of n terms of an a.p is 3n2 + 5n and its mth term is 164, find the value of m?

Given:
Sum of n terms in AP S
n = 3n2

Answer (4)

Adithyan Sanal

May 6, 2015

Find the square root of the complex number 5 − 12i. 

This answer has an image. Please click on the question to read more.

Answer (3)

G Bhanuteja

Oct 9, 2014

Q. If log12 27=a, then log6 16 is 
(i) 4(3-a)/(3+a)
(ii) 4(3+a)/(3-a)
(iii) (3+a)/4(3-a)
(iv) (3-a)/4(3+a)

This answer has an image. Please click on the question to read more.

Answer (1)

Simiran Mohapatra

Dec 14, 2014

How many numbers greater than a million can be formed with the digits 2,3,0,3,4,2,3.

This answer has an image. Please click on the question to read more.

Answer (2)

Rejitha Krishnan RG

Oct 22, 2014

if (b+c)/a,(c+a)/b,(a+b)/c are in AP, show that :
a)1/a,1/b,1/c are in AP
b)bc,ca,ab are in AP

This answer has an image. Please click on the question to read more.

Answer (2)

Nidhi

May 14, 2014

Find the domain and range of the function f(x) = √(16-x2).

Domain:- [-4,4] Range:- [0,4]

Answer (2)

Nidhi

May 15, 2014

7 + 77 + 777 + .............+7777..77(n digits) = 7/81(10n+1 -9n -10)

Sol :
Let P(n) : 7+77+777+................+(7777........777) n-terms = 7/81[10n+1-9n-10], n ϵ N   
Step 1 : For n = 1 we have
P(1) = 7 = 7/81[101+1-9-1...

Answer (1)

Shakti Gayatri

Jul 27, 2014

show that ,

2nCn=2^n[1.3.5........(2n-1)]/n!

Sol:
Given 2nCn =  (2n)! / n! n!

= (2n)! / (n!)2

= (2n) ( 2n - 1) (2n - 2) -----------4.3.2.1 / (n!)2

= 2x...

Answer (1)

Rejitha Krishnan RG

Oct 16, 2014

1)between 1 and 31, m numbers have been inserted in such a way that the ratio of 7 th and (m-1) th numbers is 5:9.find the value of m

2)if n arithemetic means are inserted between 20 and 80 such that the ratio of the first mean to the last mean is 1:3,then find the value of n

3)the ratio of the first to the last of n AMs between 5 and 35 is 1:4. find n.

4)show that the sum of n arithemetic means between given two numbers is n times the single AM between the two numbers

1) Terms of the A.P. are 1, A

Answer (2)

Rohit Jha

Jul 15, 2014

Sin 10 Sin 30 Sin 50 sin 70 = 1/16

This answer has an image. Please click on the question to read more.

Answer (5)

Umakant Biswal

Feb 21, 2015

If the sum of n terms of an a.p is 3n2 + 5n and its mth term is 164, find the value of m?

Given:
Sum of n terms in AP S
n = 3n2

Answer (4)

Adithyan Sanal

May 6, 2015

Find the square root of the complex number 5 − 12i. 

This answer has an image. Please click on the question to read more.

Answer (3)

G Bhanuteja

Oct 9, 2014

Q. If log12 27=a, then log6 16 is 
(i) 4(3-a)/(3+a)
(ii) 4(3+a)/(3-a)
(iii) (3+a)/4(3-a)
(iv) (3-a)/4(3+a)

This answer has an image. Please click on the question to read more.

Answer (1)

Simiran Mohapatra

Dec 14, 2014

How many numbers greater than a million can be formed with the digits 2,3,0,3,4,2,3.

This answer has an image. Please click on the question to read more.

Answer (2)

Rejitha Krishnan RG

Oct 22, 2014

if (b+c)/a,(c+a)/b,(a+b)/c are in AP, show that :
a)1/a,1/b,1/c are in AP
b)bc,ca,ab are in AP

This answer has an image. Please click on the question to read more.

Answer (2)

Nidhi

May 14, 2014

Find the domain and range of the function f(x) = √(16-x2).

Domain:- [-4,4] Range:- [0,4]

Answer (2)

Nidhi

May 15, 2014

7 + 77 + 777 + .............+7777..77(n digits) = 7/81(10n+1 -9n -10)

Sol :
Let P(n) : 7+77+777+................+(7777........777) n-terms = 7/81[10n+1-9n-10], n ϵ N   
Step 1 : For n = 1 we have
P(1) = 7 = 7/81[101+1-9-1...

Answer (1)

Shakti Gayatri

Jul 27, 2014

show that ,

2nCn=2^n[1.3.5........(2n-1)]/n!

Sol:
Given 2nCn =  (2n)! / n! n!

= (2n)! / (n!)2

= (2n) ( 2n - 1) (2n - 2) -----------4.3.2.1 / (n!)2

= 2x...

Answer (1)

Rejitha Krishnan RG

Oct 16, 2014

1)between 1 and 31, m numbers have been inserted in such a way that the ratio of 7 th and (m-1) th numbers is 5:9.find the value of m

2)if n arithemetic means are inserted between 20 and 80 such that the ratio of the first mean to the last mean is 1:3,then find the value of n

3)the ratio of the first to the last of n AMs between 5 and 35 is 1:4. find n.

4)show that the sum of n arithemetic means between given two numbers is n times the single AM between the two numbers

1) Terms of the A.P. are 1, A

Answer (2)

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