is -217 a term of the 27, 22, 17, 12...
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here a=27 d=-5
we know that tn=a+(n-1)d
we need to check the term -217
27+(n-1)(-5)=-217
5-5n=-244
5n=249
here 249 is not a multiple of 5
therefore n will not be a whole no
we know that n should be a whole no
therefore -217 is not a term of the sequence
we know that tn=a+(n-1)d
we need to check the term -217
27+(n-1)(-5)=-217
5-5n=-244
5n=249
here 249 is not a multiple of 5
therefore n will not be a whole no
we know that n should be a whole no
therefore -217 is not a term of the sequence
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