Find tn of the A.P. 4, 9, 14 ......... ?
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Ap ka first term =4
d=5
formula=a+(n-1)d
=4+(n-1)5
(n-1)=5×4
(n-1)=20
n=19
d=5
formula=a+(n-1)d
=4+(n-1)5
(n-1)=5×4
(n-1)=20
n=19
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