Question

how many terms of an AP 27, 24, 21 should be taken so that their sum is zero

Answer 1

Answer:

hi

here is your answer

The required term would be 19

Step-by-step explanation:

The given series is in Arithmetic Progression

27, 24, 21 ...

Here Given terms are

First term (a) = 27

Difference (d) = 24 - 27 = -3

Sum of A.P. ($S_{n}$) = 0

Number of terms = n

As we know

$S_{n} = \frac{n}{2}(2a + (n-1)d)\\  0 = \frac{n}{2}(2(27) + (n-1)(-3))\\0 = 57 n - 3n^2\\n= 19$

hence the required term would be 19

hope it helps

jerri

Answer 2

$\huge\bold\green{Answer:-}$



19



Step by step explanation :-









Hope it helps!