The first term of an arithmetic series is $5$ and the ${{25}^{\mathrm{th}}}$ term of the series is $

Question

The first term of an arithmetic series is $5$ and the ${{25}^{\mathrm{th}}}$ term of the series is $\frac{31}{5}$. Find the least value of $n$ such that the sum of the first $n$ terms of the series exceeds $1000$. [4]

Accepted Answer

$d = \frac{1}{20}$; least $n = 124$

2015 RI P1 Q2

2015 RI P1 Q2

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