if the 9 th and 10 th term of A.P. are 75 and 183 .Find 81 th term
Answers
Answered by
3
Step-by-step explanation:
a+8d= 75....(1)
a+9d= 183...(2)
(2)-(1)
d= 108
a= 75-864
a= -789
A81= a+80d
= -789+8640
=7,851
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Answered by
2
Answer:
9th term =a+8d=75
10th term=a+9d=183
eq. 1 from2
a+8d=75
a+9d=183
- - -
-d=-108
d=108
put value of d in eq.1
a+8d=a+8(108)
a=-864
then
81th term is
a+80d=-864+80(108)
-864+8640
=7776
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