Math, asked by saki792, 19 days ago

if three arithmetic means areinserted between 11 and 39, find the second arithmetic mean

Answers

Answered by alkasurin37
1

Step-by-step explanation:

So the sequence is arithmetic …

Let the sequence be 11 a2 a3 a4 39.

Then a2=11+r, where r is the common difference.

a3=a2+r=11+2*r

a4=a3+r=11+3*r

a5=39=a4+r=11+4r =>r=(39–11)/4=7

So a2=11+7=18.

Therefore the second number in the arithmetic sequence is 18

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