Question

which term of the A.P 84,80,76... is 0 ?
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Answer 1

Answer:

22

Explanation:

[a= first term, l=last term , d =difference between two consecutive terms, n=no.of terms]

84,80,76...0

a=84

d= -4

l=0

therefore

l=a+(n-1)d

0=84 +(n-1) x -4

0=84 -(n-1) 4

-84=-(n-1)4

cancelling the negative signs on both sides

84=(n-1)4

21=n-1

21+1=n

22=n

HOPE THIS HELPS YOU!!

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Answer 2

Answer:

22nd term of the AP is 0.

Explanation:

First term ( a) = 84

common difference (d) = 84-80 = 4

Tn = 0

Now,

Tn = a + (n-1) d

=> 0 = 84 + (n-1)4

=> 0 = 84 + 4n-4

=> 0 = 88 - 4n

=> n = -88/-4

Therefore, n = 22