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Find the 20th term of the AP whose 7th t...

Find the 20th term of the AP whose 7th term is 24 less than the 11th term, first term being 12.

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Here, a=12
Let the common difference of the A.P. be 'd'.
Given that, `a_(7)+24=a_(11)`
`rArr (a+6d)+24=(a+10d)`
`rArr 24=4d rArr d=6`
Now, `a_(20)=a+(20-1)d=12+19xx6=126`
`:. ` 20th term of the A.P. = 126.
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