Magical Mathematics[Interesting Approach]

given the sum of the first 5 terms of an arithmetic progression is -10 and the sum of the second 5 terms is -160. calculate the first term and the common difference of the progression .

aira fina

13 Years agoGrade

1 Answer

Aman Bansal

13 Years ago

Dear Aira,

The sum of the first n terms of an arithmetic progression is na%2B%28n%28n-1%29r%29%2F2

Apply this formula twice to get the answer.

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