What is the common difference of an A.P. in which एक अंकगणित लड़ी का साझा अंतर क्या है, जिसमें *

15
12
9
21
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What is the common difference of an A.P. in which एक अंकगणित लड़ी का साझा अंतर क्या है, जिसमें *

15
12
9
21
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here, As per our given question,
=a10-a8=a+9d
=A8=a+7d
now,a+9d-(a+7d)=42
=a+9d-7d=42
=2d=42
=d=42/2=21
the common difference of the given A.P=21
Explanation:
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