Question

if for an A.P d=5 then T18-t13

Answer 1

common difference = d = 5
first term = a = a
number of the term = n

Tn = a+(n-1)d
T18 = a+(18-1)5
T18 = a+(17)5
T18 = a+85

Tn = a+(n-1)d
T13 = a+(13-1)5
T13 = a+(12)5
T13 = a+60

so,
T18 - T13
= (a+85)-(a+60)
= a+85-a-60
= 85-60
= 25

so 25 is the answer

Answer 2

Answer:

Here, the difference between t18 and t13 is of five terms. And the common difference(d) is given 5.

It is asked to find t18 - t13,

so, the answer will be the product of difference between the terms and the common difference.

Hence, t18 - t13 =

$5 \times 5 = 25$

Ans: 25