Gujarati
8. Sequences and Series
easy

$3$ व $23$ के बीच चार समान्तर माध्य पद है

A

$5, 9, 11, 13$

B

$7, 11, 15, 19$

C

$5, 11, 15, 22$

D

$7, 15, 19, 21$

Solution

(b) माना चार समान्तर माध्य ${A_1},{A_2},\;{A_3}$ एवं ${A_4}$ हैं।

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, ${A_1} = 3 + 4 = 7,\;{A_2} = 7 + 4 = 11,$

$A_3=11+4=15,A_4=15+4=19$

Standard 11
Mathematics

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