Question

Which term of the AP 1,5,9,13,.....is 405?

Answer 1

Answer:

Tn= a+(n-1)d

405=1+(n-1)4

405= 1+4n-4

405=4n-3

4n = 408

n =102

so,

102 term of the AP 1,5,9,13,.....is 405

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