what is the common difference of an A.P in which a21-a7=84?
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6.... . is the right ans....
sakshi206:
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a21 - a7 = 84
a+20d - (a+6d) = 84
a +20d-a-6d = 84
14d = 84
d = 84/14
D = 6
a+20d - (a+6d) = 84
a +20d-a-6d = 84
14d = 84
d = 84/14
D = 6
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If the angle between tangents drawn from an external point P to a circle of radius a and centre O, is 60degree, then find the length OP?
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