is an A.p. find it's common difference.
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a1=4*1+5=9
a2=4*2+5=13
a3=4*3+5=17
then common difference
a2-a1=13-9=4
a3-a2=17-13=4
then the common difference be =4
a2=4*2+5=13
a3=4*3+5=17
then common difference
a2-a1=13-9=4
a3-a2=17-13=4
then the common difference be =4
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