Question

If a=7,n=8, Tn=28 ,find d=?

Answer 1

Answer:

Here, a=7,d=3 and n=8.

By using a

n

=a+(n−1)d

Therefore, a

8

=a+7d

=7+7×3

=28

Answer 2

Answer:

$tn = a +( n - 1)d = = \\ \\ = > 28 = 7 + (8 - 1)d \\ \\ = > 28 = 7(1 + d) \\ \\ \\ d = \frac{28}{7} - 1 \\ \\ = > d = 4 - 1 = = > > 3$

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