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CBSE Class 10 Answered

If n-2, 4n-1, 5n+2 are the first three terms of an A.P., then find its 4th term.
Asked by | 09 Nov, 2012, 08:49: PM
answered-by-expert Expert Answer
Common difference = 3rd term-2nd term=2nd term - 1st term
5n+2-4n+1=4n-1-n+2
 
n+3=3n+1
 
2n=2
n=1
1st term = 1-2 = -1
 
common difference=4n-1-n+2=3n+1=4
 
4th term=a+3d = -1+3x4 = 11
Answered by | 10 Nov, 2012, 12:58: PM

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