Question

if a=10 , d= -5 then find tn=?​

Answer 1

Answer:

We know that the formula for the nth term is t

n

=a+(n−1)d, where a is the first term, d is the common difference.

It is given that the first term is a=12, the nth term is t

n

=76 and the difference is d=4, therefore,

t

n

=a+(n−1)d

⇒76=12+(n−1)4

⇒76=12+4n−4

⇒76=4n+8

⇒4n=76−8

⇒4n=68

⇒n=

4

68

=17

Hence, n=17

Answer 2

Answer:

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