The sum of 5 numbers in ap is 30
Asked by admin @ in Math viewed by 341 People
The sum of 5 numbers in ap is 30 and the sum of their squares is 220. which of the following is the third term?
Answered by admin @
Let five numbers in A.P. be a – 2d, a – d, a, a + d and a + 2d.
Given (a – 2d) + (a – d) + a + (a + d) + (a+ 2d) = 30
Putting a = 6, we get
When a = 6 and d = 2, we get
when a = 6 and d = –2, we get
Five numbers in A.P. are 2, 4, 6, 8 and 10.
Thus, the third number is 6.
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