Question

3. in an AP, 18, 13, 8,3,..., S35​

Answer 1

-1120

Step-by-step explanation:

here a=18

d=13-18=-5

n=35

$s = \frac{n}{2} (2a + (n - 1)d) \\ = \frac{35}{2} (2 \times 18 + 34 \times ( - 3)) \\ = \frac{35}{2} \times (36 - 102) \\ = \frac{35}{2} \times ( - 64) \\ = 35 \times (- 32) \\ = - 1120$

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Answer 2

-1120

Step-by-step explanation:

here a=18

d=13-18=-5

n=35

\begin{gathered}s = \frac{n}{2} (2a + (n - 1)d) \\ = \frac{35}{2} (2 \times 18 + 34 \times ( - 3)) \\ = \frac{35}{2} \times (36 - 102) \\ = \frac{35}{2} \times ( - 64) \\ = 35 \times (- 32) \\ = - 1120\end{gathered}

s=

2

n

(2a+(n−1)d)

=

2

35

pls Mark the above as brainlist

(2×18+34×(−3))

=

2

35

×(36−102)

=

2

35

×(−64)

=35×(−32)

=−1120