which term of A.P. 18,31/2,13,.....is -47
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a1=18
a2=31/2
d=31/2-18=-5/2.
an=-47
-47=18+(n-1)(-5/2)
-47-18=-5/2n+5/2
-65-5/2=-5n/2
-135/2=-5n/2
27=n.
check if it is right or not.
a2=31/2
d=31/2-18=-5/2.
an=-47
-47=18+(n-1)(-5/2)
-47-18=-5/2n+5/2
-65-5/2=-5n/2
-135/2=-5n/2
27=n.
check if it is right or not.
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