Question

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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Answer 1

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

Answer 2

Explanation:

Dasna ki sister jo sadda man karda esi vhi karda