Question

Find the sum of 20 th term of series 2-4+6-8+10-12+
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Answer 1

Answer:

14

I hope is the answer according to series

Answer 2

Answer:

s=(2+6+10....+t(19)) - (4+8+12...+t(20))

19th term= 2+(19-1)4=74

20th term= 4+(20-1)4=80

=19/2(2+74)) - 20/2(4+80))

=(19*76/2) - (20*84/2)

=722-840

= (-118)