The natural numbers between 1 and 81 divisible by 6 are 6, 12, 18, ..., 78.Here, a = 1, = 6, d=6, 1, = 78, n=?, Sn=?
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Answer:
n=78
Sn=n/2[a+l]
=78/2[6+78]
=39[84]
=3276
Step-by-step explanation:
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