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Question

Question 1 (vii)
Which of the following form an AP? Justify your answer.
3,12,27,48


Solution

3,12,27,48,i.e. 3, 23, 33, 43, 
Here,      t1=3, t2=23, t3=33 and t4=43
t2t1=233=3
t3t2=3323=3
t4t3=4333=3
Clearly, the difference between successive terms is same.
Therefore, given list of numbers form an AP.

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