Question 1 (iv)
Which of the following form an AP? Justify your answer.
11, 22, 33, ….

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Solution

$H e r e, t_{1} = 11, t_{2} = 22, t_{3} = 33$
$t_{2} - t_{1} = 22 - 11 = 11$
$t_{3} - t_{2} = 33 - 22 = 11$
$t_{4} - t_{3} = 33 - 22 = 11$
Clearly, the difference between successive terms is same.
Therefore, given list of numbers form an AP.

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