Question

Solve.
(i) Which term of A.P.21, 18, 15, ... is - 81?
(ii) Which term of A.P. 84, 80, 76, ... is zero?
(iii) Is 301 is any term of sequence 5, 11, 17, 23,
... ?
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Answer 1

1)a=21,d=-3

now,a–81=a+(n-1)d=21-(-81-1)3=267

a-81=267

So 267th term is -81

2)a=84,d=-4

a0=84+(0-1)(-4)=84+4=88

So 88th term is zero...

3)yes..solve it like above method.....

Hope u can understand it frnd...

Answer 2

Answer:

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