World Languages, asked by abdulrahimseleman, 8 months ago

. In a certain arithmetic progression, the sum of the first and fifth terms is 18 and the third term is 6 less than the fifth term. Find the sum of the first twenty terms.

Answers

Answered by Anonymous

Answer:

hey mate

Explanation:

The Sum Formula

The formula says that the sum of the first n terms of our arithmetic sequence is equal to n divided by 2 times the sum of twice the beginning term, a, and the product of d, the common difference, and n minus 1. The n stands for the number of terms we are adding together.

Answered by lovelytanzilla

Answer:

630

Explanation:

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