Question

If the the 3rd and the 9th terms of an AP are 4 and -8 respectively, which term of this AP is zero??​

Answer 1

Step-by-step explanation:

here ur answer

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Answer 2

Answer:

5th

Step-by-step explanation:

given t3= 4

t9=-8

to find n where tn= 0

as given a+2d=4 eq.(I) and a+8d = -8 eq.(ii)

on subtracting eq.i from eq. ii

6d=-12

which gives d= -2

no put the value of (d) in any equation which would give you the value for ( a ) = 8

to get tn = 0

tn = a + (n-1)×d

put all value

0= 8+ (n-1) × -2

-8= (n-1) ×-2

-8/-2=n-1

4=n-1

n=4+1= 5