Question

Find the sum of first 18 terms of the A.P 10,6,2………​

Answer 1

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10th

Maths

Arithmetic Progressions

Sum of an AP

The sum of first 16 terms o...

MATHS

The sum of first 16 terms of the A.P. 10,6,2,... is

MEDIUM

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ANSWER

Given

a=10,n=16,d=6−10=−4

We know that

S

n

=

2

n

[2a+(n−1)d]

∴S

16

=

2

16

[2×10+(16−1)(−4)]

⇒S

16

=8[20+15(−4)]

⇒S

16

=8×(−40)

⇒S

16

=−320

Step-by-step explanation:

i took 16......