If `a_(n)` denotes the nth term of the AP 2, 7, 12, 17,…., find the value of `(a_(30)-a_(20))`

If a_(n) denotes the nth term of the AP 3, 18, 13, 18,… then what is the value of (a_(30)-a_(20))?

If a_(n)=3n+4 is the nth term of an AP then find the first four terms

If a_(n) be the n^(th) term of an AP and if a_(1) = 2 , then the value of the common difference that would make a_(1) a_(2) a_(3) minimum is _________

If a_(n) be the n^(th) term of an AP and if a_(1) = 2 , then the value of the common difference that would make a_(1) a_(2) a_(3) minimum is _________

If a_(n) represents the nth term of the sequence 45, 18, 6, …, and a_(1) represents the first term, then a_(n)=

A person is to count 4500 currency notes. Let a_(n) denote the number of notes he counts in the nth minute. If a_(1) = a_(2) = "………" = a_(10) = 150 and a_(11) , a_(12),"……….." are in an A.P. with common difference -2, then the time taken by him to count at notes is :

If a_(1),a_(2)...a_(n) are the first n terms of an Ap with a_(1)=0 and d!=0 then (a_(3)-a_(2))/(a_(2))+(a_(4)-a_(2))/(a_(3))+(a_(5)-a_(2))/(a_(4))...+(a_(n)-a_(2))/(a_(n-1)) is

If a_(1) = 2 and a_(n) - a_(n-1) = 2n (n ge 2) , find the value of a_(1) + a_(2) + a_(3)+…+a_(20) .