Question

If for any A.P , d=5 then find it t18 - t13​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

t 18 - t 13 = 145

Step-by-step explanation:

d= 5 n = 18

tn= a+ ( n- 1 ) d

.: t18 = a+ ( 18 - 1 ) 5

.: t 18 = a+ (17) 5

.: t 18 = a + 85 .......(1)

d = 5 n = 13

.: t 13 = a+ ( 13 - 1 ) 5

.: t 13 = a+ ( 12 ) 5

.: t 13 = a + 60 ..........(2)

subtracting (2) from (1)

t 18 - t 13 = a + 85 - a + 60

= 85 + 60

t 18 - t 13 = 145