Question
$3$ व $23$ के बीच चार समान्तर माध्य पद है
अत:, $3,\;{A_1},\;{A_2},\;{A_3},\;{A_4},\;23$ समान्तर श्रेणी में होंगे
$\therefore $ ${T_6} = 23 = a + 5d$
$ \Rightarrow $$d = 4$
इस प्रकार, ${A_1} = 3 + 4 = 7,\;{A_2} = 7 + 4 = 11,$
$A_3=11+4=15,A_4=15+4=19$
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