class 10 maths 5.2 2 numberroman 1 0,7,4......ap is 3o
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Step-by-step explanation:
s30=n/2{2a+(n-1)d}
=30/2{2×10+(30-1)3}
=15{20+29×3}
=15{20+87}
=15×107
s30=1605
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