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Find the sum of 7,10 1/2,14 …

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Find the sum of 7,10 1/2,14 . .. 84

Posted by Sanjay Harsha 6 years, 11 months ago

Lekshmi V S 6 years, 11 months ago

n=23 Sn=1046 1/2

Yogita Ingle 6 years, 11 months ago

Here, a = 7, d = 3.5 and last term = 84

Number of terms can be calculated as follows;

{tex}a_n = a+(n−1)d{/tex}

Or, {tex}84 =7+(n−1)3.5{/tex}

Or, {tex}(n−1)3.5 = 84−7{/tex}

Or, {tex}n−1 = 77 /3.5 = 22{/tex}

Or, {tex}n = 23{/tex}

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