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Question

What is the common difference of an AP in which a27a7=84
 


Solution

Let a is the first term and d is the common difference of an AP 
27th term = a + ( 27 -1)d = a + 26d 
7th term = a + (7 -1)d = a + 6d 

now, 
a +26d -a -6d = 84 

20d = 84 

d = 4.2 ( answer)

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