Question

If for an AP,d=5,then t18-t13=?
a)5 (b) 20 (c) 25 (d) 30​

Answer 1

Answer:

(c) 25

Step-by-step explanation:

Let, common difference = d = 5,

first term = a = a,

and, 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

T18 - T13

= (a+85)-(a+60)

= a+85-a-60

= 85-60

= 25

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Answer 2

Answer:

answer is (c)25

Step-by-step explanation:

it is given that d=5

and we have to find t18 - t13

t18 - t13

=a+17d-(a+12d)

=a+17d-a-12d

=5d

=5×5

=25

so option c is correct

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