Question

Find the sum of the series in ap 3+7+11+15+........2n terms

Answer 1

Answer:

a=3

d=a2-a1=7-3=5

an=2

n=?

an=a+(n-1)d

2=3+(5n-5)

3+2=5n-5

5+5=5n

10=5n

n=10/5

n=2

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