1.

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

Answer»

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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