find the common difference of the A.P. , for which 5th term is 23 and 3rd term is 31
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Answer:
5th term of the A.P=23
a5=a+(n-1)d
23=a+(5-1)d
23=a+(4)d
23=a+4d
3rd term of the A.P=31
a3=a+(n-1)d
31=a+(3-1)d
31=a+(2)d
31=a+2d
by using elemination method in the equations
a+4d=23
a+2d=31
we get d =-4
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