Question

find 3 a.m. 's between 3 and 19​

Answer 1

Answer:

Let A1, A2 & A3 be three arithmetic means between 3 &19.

Then,

3, A1, A2,A3, 19 will be in AP

Total no. of terms = 5

a= 3

=) 3+4d= 19

=) 4d= 19-3

=)4d= 16

=)d= 16/4

=)d= 4

So,

A1= a+d= 3+4= 7

A2= a+ 2d= 3+ 8 = 11

A3= a+3d

=) a + 3(4)

=) 3+ 12 = 15