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The sum sum(k=1)^(20) (1+2 +3 +....+k )...

The sum ` sum_(k=1)^(20) (1+2 +3 +....+k ) ` is

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JEE MAINS PREVIOUS YEAR-JEE MAIN-MATHEMATICS
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  11. Find the integration int dx /((x - 3)^(6/7)(x + 4)^(8/7) =

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  12. A sphere of 10cm radius has a uniform thickness of ice around it. Ice ...

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  19. 2^(1/4). 4^(1/16). 8^(1/48) .........oo =

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