Find a30-a 20 for AP:a,a+d,a+2nd,......
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Answered by
1
a30=a+29d
a20=a=19d
a30-a20=a+29d-a-19d=20d
ans is 20d.
a20=a=19d
a30-a20=a+29d-a-19d=20d
ans is 20d.
Answered by
1
Answer is 10d
We know that
Common difference=2d-d=d
an= a+(n-1)d
an=a+(30-1)d
an=a+(20-1)d
Then
a30-a20=a+29d-(a+19d)=a+29d-a-19d
a30-a20=10d
We know that
Common difference=2d-d=d
an= a+(n-1)d
an=a+(30-1)d
an=a+(20-1)d
Then
a30-a20=a+29d-(a+19d)=a+29d-a-19d
a30-a20=10d
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