help me guyz plz...
what is the common difference of an A.P. in which A21-A7=84?
Answers
Answered by
2
A21-A7=84
a+20d-(a+6d)=84
a+20d-a-6d=84
14d=84
d=84/14
d=6
Answered by
3
Answer: d=6
Step-by-step explanation: a21= a+20d
a7= a+6d
a21 - a7= (a+20d) - (a+6d)= a+20d -a -6d= 84 ( a and -a get cancelled)
14d= 84
d=84/14
=6
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