Question

Pls answer this question.
two APs have same common difference.the first term of one AP is 2 and that of the other is 7.the difference between their 10th terms is the same as the difference between their 21st terms.which is the same as the difference between any two corresponding terms.why?
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Answer 1

Answer:

i don't know....plz don't mind

Step-by-step explanation:

i don't know....plz don't mind