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Two A.P.'s have the same common differen...

Two A.P.'s have the same common difference. The first term of one A.P. is 2 and that of the other is 7. Show that the difference between their 10th terms is the same as the difference between their 21th terms, which is the same as the difference between any two corresponding terms.

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The correct Answer is:
Difference between their 10th and 21st term = `-5`
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