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Insert five numbers between 8 and 26 such that the resulting sequence is an A.P.

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Insert five numbers between 8 and 26 such that the resulting sequence is an A.P.
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`a_1=8, a_2 , a_3, a_4,a_5,a_6,a_7=26`
`a_7 = a_1 +6d`
`26 = 8+6d`
`d=3`
`8 , 8+3,8+6 , 8+ 9 , 8+12,8+15 , 8+18`
=`8,11,14,17,20,23,26`
is the series
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