In an arithmetic progression,the nth term is 6 less than the 7th term. The common difference-3.find the value of n
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Answer:
n=9
Step-by-step explanation:
a+(n-1)d = a+6d-6
so, (n-1)d = 6d-6
d is given as -3
so, (n-1)(-3) = 6*-3 - 6
n-1 = -24/-3
n-1 = 8 then n= 9
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