Question

Find the sum of all three digit numbers, which are multiples of 9. The expressions for the sum to n terms of some arithmetic seque are given below. Find the expression for the nth term of each: - A - i) n2+ 2n ii) 2n+n iii) n2 - 2n iv) 2n2 - v) na-n Calculate in head, the sums of the following arithmetic sequenc​

Answer 1

Answer:

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