Question

(4) For an A.P. if tn=4, n=7, d= -4, then a=...​

Answer 1

Answer:

it is given that,

tn=4,n=7,d=-4,a=?

tn=2a+(n-1)d

4=2a+(7-1)-4

4=2a+(6)-4

4/-4=2a+6

-1=2a+6

-1-6=2a

-7=2a

a=-7/2

Answer 2

Answer:

a = 28.

Step-by-step explanation:

tn = a + (n-1)*d

or , 4 = a + (7-1)*-4

or , 4 = a + 6 * -4

or , 4 = a - 24

or , a= 28.

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