find 31th term of ap whose 11th term is 38 and 16th term is 73
Answers
Answered by
6
i hope it will help..
Attachments:
Answered by
4
a11=a+10d=38.........<1>
a16=a+15d=73.........<2>
Substitute the equation 2 from 1
a+15d=73
a+10d=38
- - -
--------
5d=35
d=7
put the value of (d) in equation 1
a+10d=38
a+10×7=38
a+70=38
a=-70-38
a=-108
put the value of a and d in eq (a+30d)
=-108+30×7
=-108+210
=102
So,the 31st term of A.P is 102
Similar questions