Question

what is the common difference (d) of the A. P s, 1,-3, -7 . ......?​

Answer 1

Answer:

Formula and Given,

a

n

=a+(n−1)d

50=5+(n−1)3

solving the above equation, we get,

n=16

S

n

=

2

n

[2a+(n−1)d]

=

2

16

[2(5)+(16−1)(3)]

solving the above equation, we get,

∴S

n

=440

Step-by-step explanation:

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Answer 2

Answer:

-4

Step-by-step explanation:

common difference (d) = -3 - (1) = -4 also, -7 - (-3) = -4