Question

Which term of the AP. 100, 90, 80....is zero

(a) 5th (6) 6th (c) 10th

(d) 11th
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Answer 1

Answer:

the 10th term of that AP is zero

Answer 2

Answer:

A1 = 100

A2 = 90

d = A2 - A1

= 90 - 100

= - 10

Let the required term be. n

nth term of A.P = A1 + ( n - 1 ) d

0 = 100 + ( n - 1 ) ( - 10 )

So,

- 100 = - 10 ( n - 1 )

- 100/- 10 = ( n - 1 )

10 = n - 1

10 + 1 = n

n = 11 ANSWER

100 - 1st

90 - 2nd

80 - 3rd

70 - 4th

60 - 5th

50 - 6th

40 - 7th

30 - 8th

20 - 9th

10 - 10th

0 - 11th

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