AP 3,8,13,18, will be 55 more than it's 20th term
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Here a= 3
d= 8-3=5
then
Tn = a(n-1)d
=3(20-1)5
=3×19×5
=285
here
285+55=340
Here Tn= a(n-1 )d
340=3(n-1)5
340=15(n-1)
340/15=n-1
(340/15)+1=n
(340+15)/15=n
355/15=n
now, n=31
d= 8-3=5
then
Tn = a(n-1)d
=3(20-1)5
=3×19×5
=285
here
285+55=340
Here Tn= a(n-1 )d
340=3(n-1)5
340=15(n-1)
340/15=n-1
(340/15)+1=n
(340+15)/15=n
355/15=n
now, n=31
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