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Asked by Rohit Jha

Jul 15, 2014

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

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Asked by Umakant Biswal

Feb 21, 2015

If the sum of n terms of an a.p is 3n^{2} + 5n and its m^{th }term is 164, find the value of m?

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Asked by Adithyan Sanal

May 6, 2015

Find the square root of the complex number 5 âˆ’ 12i.

Asked by G Bhanuteja

Oct 9, 2014

Q. If log_{12} 27=a, then log_{6 }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)

(i) 4(3-a)/(3+a)

(ii) 4(3+a)/(3-a)

(iii) (3+a)/4(3-a)

(iv) (3-a)/4(3+a)

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Asked by Nidhi

May 14, 2014

Find the domain and range of the function f(x) = âˆš(16-x^{2}).

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

Asked by 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

a)1/a,1/b,1/c are in AP

b)bc,ca,ab are in AP

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Asked by 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.

Sol:

Here one million = 10,00,000.Given numbers are 2,3,0,3,4,2,3.

A number greater than 1000000 has 7 places,and all the digits are to be used.But 2 is repeated twice and 3 is repeated th...

Here one million = 10,00,000.Given numbers are 2,3,0,3,4,2,3.

A number greater than 1000000 has 7 places,and all the digits are to be used.But 2 is repeated twice and 3 is repeated th...

Asked by Nidhi

May 15, 2014

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

Sol :

Let P(n) : 7+77+777+................+(7777........777) n-terms = 7/81[10^{n+1}-9n-10], n Ïµ N

Step 1 : For n = 1 we have

P(1) = 7 = 7/81[10^{1+1}-9-1...

Let P(n) : 7+77+777+................+(7777........777) n-terms = 7/81[10

Step 1 : For n = 1 we have

P(1) = 7 = 7/81[10

Asked by 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

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

Asked by Shakti Gayatri

Jul 27, 2014

show that ,

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

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

Sol:

Given ^{2n}C_{n }= (2n)! / n! n!

= (2n)! / (n!)^{2}

= (2n) ( 2n - 1) (2n - 2) -----------4.3.2.1 / (n!)^{2}

= 2x...