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The first term of an A.P. is 5 and the c...

The first term of an A.P. is 5 and the common difference is 4. Complete the following activity and find the sum of first 12 terms of the A.P. Here, `a=5, d=4,S_(12)=?`
`S_(n)=(n)/(2)[.............]`
`thereforeS_(12)=(12)/(2)[10+..........]`
`=6xx...............=.............`

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The correct Answer is:
`2a+(n-1)d,11xx4,54,324`
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-ARITHMETIC PROGESSION -PRACTICE SET 3.4
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  13. The 21st term of an AP whose first two terms are -3 and 4, is

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  14. If for an A.P.,d=5, then t(18)-t(13)=….

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