Question

please solve this...........​

Answer 1

Answer:

1) first term =1-4(1)

=1-4

=-3

25 term=1-4(25)

1-100

=-99

sum=n(a+l)/2

=25/2(-99-3)

=25*(-102)/2

=25*(-51)

-1275

2)first term =2-3(1)

=2-3

=-1

25 term=2-3(25)

=2-75

=-73

sum=n(a+l)/2

25/2(-1-73)

25*-74/2

25*-37

=-925

hope it helps

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