Sum of 1+3+5+7.... 40= 1600
find Sum of 11 +33+55....40 term
find sum of 9+27+45.....40 term
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Sum of 1+3+5+7.... 40 term= 1600
Sum of 11 +33+55....40 term
= 11 × Sum of 1+3+5+7.... 40 term
= 11 × 1600
= 17600
Sum of 9+27+45.....40 term
= 9 × Sum of 1+3+5+7.... 40 term
× Sum of 1+3+5+7.... 40 term= 9 × 1600
× 1600= 14400
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