A shopkeeper had a 40 kg weight stone unfortunately it had been broken into 4 pieces. But he can measure the weight with those four stones from 1 to 40 kg. He can weight 1kg 2kg 3kg as so....
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Answer:
It is simple
formula an=a+(n-1)d
a=1 d=2-1=1
an=40
ans= 37 ÷2=16.5
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