Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

find four numbers in AP whose sum is 20 and sum of whose squares is 120
Asked by sonaisha | 09 Mar, 2009, 06:28: PM
Expert Answer

four numbers in A.P. be

a-3d,a-d,a+d,a+3d..(imp step)

Acc to question,

a-3d+a-d+a+d+a+3d=20

So,

4a=20

a=5

Next,

 sum of the squares of these numbers =120 (given)

So, the A.P. is

2,4,6,8 (with d=1)

or

8,6,4,2 (with d=-1)

 

Answered by | 10 Mar, 2009, 12:04: PM
Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment

Concept Videos

Application Videos

Answered Unanswered My Questions My Answers
CBSE 10 - Maths
Prove that cosA = cotA/√1+cot^2A
Asked by devanshsinghbais111 | 11 Oct, 2022, 01:57: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Some student planned a picnic. The budget for the food was ₹480.as eight of them failed to join the party, the cost of the food for eachember increase by ₹10 find howany student went on the picnic
Asked by Subuhiansari67 | 28 Sep, 2022, 10:11: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Given that sin tita =a/b,then tan tita is equal to
Asked by Bavashreelogasundaram | 22 Sep, 2022, 08:26: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
An article was sold at a profit of 12%. if the cost price would be 10% less and selling price would be rupess 5.75 more, there would be profit of 30%. then at what price it should be sold to make a profit of 20%
Asked by srinew414 | 03 Sep, 2022, 12:16: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
if one zero of the polynomial is (a²+9) x²+13x+6a is reciprocal of the other ,find the value of a
Asked by sharmaraushan079 | 19 Aug, 2022, 04:04: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Express each number as product of its prime factors: (i) 140 (ii) 156 (iii) 3825 (iv) 5005 (v) 7429
Asked by Sunita | 08 Aug, 2022, 01:06: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Five years ago Nuri was thrice as old as Sonu. Ten years later Nuri will be twice as old as Sonu. How old are Nuri and Sonu?
Asked by choithanimahak | 05 Aug, 2022, 09:06: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
hcf and lcm of 96,207
Asked by aayeshashaikh40.10 | 24 Jul, 2022, 06:42: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
A box contains the same cards with the number 4 to 128 . A card is drown at random. Find the probability that the drown card having number 1) Odd number 2) Multiple of 4 and 6 3) Multiple of 4 or 6 4) Neither multiple of 4nor of 6 5) Not divisible by 5
Asked by aswathyachu1571as | 21 Jul, 2022, 11:39: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
g(x) = a(x² + 1) - x(a² + 1)
Asked by mish70003 | 20 Jul, 2022, 03:29: PM
ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Season Break Offer!
Get 60% Flat off instantly.
Avail Now
×