what value of n, makes the nth term of both APs same?
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hope it helps you....
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Vishal1102:
I got a doubt
on LHS how can you add 6 and 1 when 6 is in multiplication with (n-1) ?
oh ok
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1. tn = a+(n-1)d
a=1, d=7-1=6
tn=1+(n-1)6
=1+6n-6
=6n-5
2. a=69, d=68-69=-1
tn=69+(n-1)-1
=69-1n+1
=70-n.
6n-5=70-n
6n+n=70+5
7n=75
n=75/7
I think some thing wrong you carefully see could I make mistake.. Because n is decimal otherwise write 75/7.
a=1, d=7-1=6
tn=1+(n-1)6
=1+6n-6
=6n-5
2. a=69, d=68-69=-1
tn=69+(n-1)-1
=69-1n+1
=70-n.
6n-5=70-n
6n+n=70+5
7n=75
n=75/7
I think some thing wrong you carefully see could I make mistake.. Because n is decimal otherwise write 75/7.
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