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Complete the activity by filling the boxes, to find `S_(30)`, if the first term of an A.P. is 10 and the common difference 5.
Activity
Here, `a=10,d=5,S_(30)=?`
`S_(n)=(n)/(2)[square+(n-1)d]`
`thereforeS_(n)=(30)/(2)[20+(30-1)xxsquare]`
`=15xx[20+square]`
`=square`
`S_(30)=square`

Text Solution

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The correct Answer is:
`2a, 5, 145, 2475,`
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-ARITHMETIC PROGESSION -PRACTICE SET 3.4
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