if 10 times 10th term is equal to 20 times of 20th term of an ap .find 30th term
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141
let x be first term and a be the common difference
10th term = x+9a
20th term=x+19a
30th term=x+29a
given
10*10th term=20*20th term
10(x+9a)=20(x+19a)
10x+90a=20x+380a
20x-10x+380a-90a=0
10x+290a=0
10(x+29a)=0
x+29a=0
30th term=0
10th term = x+9a
20th term=x+19a
30th term=x+29a
given
10*10th term=20*20th term
10(x+9a)=20(x+19a)
10x+90a=20x+380a
20x-10x+380a-90a=0
10x+290a=0
10(x+29a)=0
x+29a=0
30th term=0
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