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Q.

If the common difference of an A.P is 5, then what is a18−a13 ?


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a

5

b

20

c

25

d

30 

answer is C.

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Detailed Solution

an=a+n-1d
a18-a13=a+18-15-a+13-15
=175-125
=5×5
=25
 
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