Is 205 any term of the progression 1,7,13
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a=1
d=7-1=6
Tn= a +(n-1)d
205=1+(n-1)7
204=7n-7
211/7=n
which is not possible
therefore it is not a term
d=7-1=6
Tn= a +(n-1)d
205=1+(n-1)7
204=7n-7
211/7=n
which is not possible
therefore it is not a term
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