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Question
How many terms of Arithmetic Progression (A.P) 21, 18, 15, 12 , ..... must by taken to give the sum zero?
10
15
22
27
ANSWER : 2
Descrption
ATQ, <br/> 5x + 6x + 7x = 180 <br/> Or, 18x = 180 <br/> Or, x = 10 <br/> So, the difference in degrees between the biggest and the smallest angles = 70 - 50 = 20 degree.
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