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The sum of 5th and 9th term of an A.P. i...

The sum of 5th and 9th term of an A.P. is 72 and the sum of 7th and 12th terms is 97 . Find that

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Given,
`a_5​+a_9​=72`
`a+4d+a+8d=72`
`2a+12d=72`............(1)
also,
...
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