Question

give me the answer of chapter 5 and exercise 5.1 ) qn: 7

Answer 1

11th term a11=38
16th term a16=73
we know that common difference of A.P
an=a+(n-1)d
a11=a+(11-1)d=38
a+10d=38 eq (1)
similarly
a+15d=73 eq (2)
on subtracting eq (1) from eq (2) we obtain
d=7 & a= -32
a31= -32+(31-1)7
-32+210
=178 ans
hope it will help u