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Question

Question 4 (xii)
Which of the following are APs? If they form an A.P. find the common difference d and write three more terms.
(xii) 2,8,18,32


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Solution

(xii) 2,8,18,32
Here,
a2a1=82=222=2a3a2=188=3222=2a4a3=3218=4232=2
an+1an is same everytime.
Therefore,d=2 and the given numbers are in A.P.
Next three terms are:
a5=32+2=42+2=52=50a6=52+2=62=72a7=62+2=72=98


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