Determine whether the given sequence is an progression ?6,9,12,15... justify
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given 6,9,12,15...
a1=6,a2=9,a3=12,a4=15
a2-a1=9-6=3
a3-a2=12-9=3
a4-a3=15-12=3
therefore
a2-a1=a3-a2=a4-a3=3
common difference =d=3
6,9,12,15,... are in arithmetic progression
a1=6,a2=9,a3=12,a4=15
a2-a1=9-6=3
a3-a2=12-9=3
a4-a3=15-12=3
therefore
a2-a1=a3-a2=a4-a3=3
common difference =d=3
6,9,12,15,... are in arithmetic progression
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