Question

if the 9 th and 10 th term of A.P. are 75 and 183 .Find 81 th term
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Answer 1

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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Answer 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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