Question

find the term t18 of an AP 7, 13, 19, 25 ....​

Answer 1

let 'a' be the first term and 'd' be the common difference

first term (a) = 7
common difference (d) = 13 - 7 = 6

nth term = 18

by putting formula,

an = a+(n-1)d

=7+(18-1)6

= 7+(17)6

= 7+102

= 109

therefore,18th term of an ap is 109


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