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
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