Question

to calculate the difference between the sum of the first 20 terms of the arithemetic Sequence 6, 10, 14 and 15, 19, 23.

Answer

Difference =1060-880=180

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Answer 1

Answer:

difference between the sum of the first 20 terms of the arithmetic sequence 6,10,14 and 15,19,23

20/2{2.6+(20-1).4}-20/2{2.15+(20-1).4

=10{12+19.4}-10{30+19×4}

=10(12+76-30-76)

=10(-18)

= -180

so the difference is 180