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If the 9th and 21st terms of an A.P. ar...

If the 9th and 21st terms of an A.P. are 75 and 183 respectively, then find the 15th term.

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15th term is129
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Knowledge Check

  • If the 3rd and 7th terms of an A.P. are 17 and 27 respectively . Find the first term of the A.P.:

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