Question

Calculate the difference between the sums of the first 20 terms of the
arithmetic sequences 6, 10, 14, ... and 15,19,23, ...
Find the sum of all three digit numbers, which are multiples of 9.
The expressions for the sum to n terms of some arithmetic sequence
are given below. Find the expression for the nth term of each:
i) n2+ 2n
ii) 2n+n
iii) n2 - 2n
v) 2n2 - n
v) na-n​

Answer 1

Answer:

this your answer my friend

3+46+66544+55-68843+6545799-874668++86457(++656=sign