1.

Find the sum `(41+42+43+…+100).`

Answer» Correct Answer - 4230
Given sum `=(1+2+3+...+40+41+...+100)-(1+2+3+...+40)`
`=((1)/(2)xx100xx101)-((1)/(2)xx40xx41)=(5050-820)=4230.`


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