Question

Write the sum of AP of first 20 terms,3,1,-1,-3

Answer 1

Answer:

Sum=-320

Step-by-step explanation:

a=3

d=-2

a20=3+19×(-2)

=3-38

=-35

S20=20/2(3-35)

=10×(-32)

=-320

Answer 2

Answer:

.......................................... This is the required answer.

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