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Question -

Determine the AP whose 3rd term is 16 and 7th term exceeds the 5th term by 12.



Answer -

Given,

Third term, a3┬а= 16

As we know,

a┬а+(3тИТ1)d┬а=16

a+2d┬а= 16тАжтАжтАжтАжтАжтАжтАжтАжтАжтАжтАжтАжтАжтАжтАж.┬а(i)

It is given that, 7th┬аtermexceeds the 5th┬аterm by 12.

a7┬атИТ┬аa5┬а= 12

[a+(7тИТ1)d]тИТ[a┬а+(5тИТ1)d]= 12

(a+6d)тИТ(a+4d) = 12

2d┬а= 12

d┬а= 6

From equation┬а(i), we get,

a+2(6) = 16

a+12 = 16

a┬а= 4

Therefore, A.P. will be4, 10, 16, 22, тАж

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