If 6 times of 6th term of an A. P. is equal to 7 times the 7th term, then find the 13th term
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If 6 times of 6th term of an A. P. is equal to 7 times the 7th term
6(a+5d)=7(a+6d)
=>a=(-12d)
13th term=a+(n-1)d=a+12d=(-12d)+12d=0
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