Class 10

Math

Algebra

Sequences and Series

In $A.P.$, the first term is 8, $n_{th}$ term is 33 and sum to first n terms is 123. Find n and d, the common diffirence.

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The AM between two positive numbers a and $b(a>b)$ is twice their GM. Prove that $a:b=(2+3 ):(2−3 )$.

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