The value of the 3rd term of the expression 4n+1 – InterviewSolution

1.

The value of the 3rd term of the expression 4n+1

Answer»

Tn=4n+1

SUM =∑ 15/ k=1 (4k+1)

=∑

k=1

15

4k+∑

k=1

15

(1)

=4[1+2+3+4+..........+15]

=4×

2

15×(15+1)

+15

=480+15

=

495

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