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Question

In an A.P. the sum of first n terms is 3n22+13n2. Find the 25th term. [3 MARKS]


Solution

Formula: 1 Mark
Application: 1 Mark
Answer: 1 Mark

Sn=3n2+13n2

an=SnSn1

a25=S25S24

a25=3(25)2+13(25)23(24)2+13(24)2

a25=12[3(252242)+13(2524)]

a25=12[3(49)+13]

a25=80

Mathematics

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