Ex9.1,1
Write the first five terms of the sequences whose nth term is an = n(n+2)
We need to find first five terms
i.e. a1, a2, a3 , a4, a5
an = n(n + 2)
Putting n = 1 in an
a1 = 1(1 + 2)
= 1 × 3
= 3
Putting n = 2 in an
a2 = 2(2 + 2)
= 2 × 4
= 8
Putting n = 3 in an
a3 = 3(3 + 2)
= 3 × 5
= 15
Putting n = 4 in an
a4 = 4(4 + 2)
= 4 × 6
= 24
Putting n = 5 in an
a5 = 5(5 + 2)
= 5 × 7
= 35
Hence first five terms are
3, 8, 15, 24, and 35.

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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