Find the sum to 30 terms of the ap a-b, a, a+b
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1st term=a-b
common diff=a-(a-b)=a-a+b=b
sum=(30/2){2(a-b)+(30-1)b}
=15{2a-2b+29b}
=15{2a+27b}
=30a+405b Ans
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