एक A.P. का n वाँ पद `S_(n) = 3n^(2) + 2n` हैं । A.P. ज्ञात कीजिए और इसका 15 वाँ पद भी ज्ञात करें ।

Is the sequence defined by a_(n) = 3n^(2) + 2 an A.P. ?

Is the sequence defined by a_(n) = 3n^(2) + 2 an A.P. ?

S_n in A.P.=

In an A.P., if a = 1 , a_(n) = 20 and S_(n) = 399 , then n = ……..

In an A.P. if a=2, t_(n)=34 ,S_(n) =90 , then n=

In an A.P. if a=2, t_(n)=34 ,S_(n) =90 , then n=

If S_(n)=3n^(2)+2n, Then prove that series is in A.P

The sum of n terms of an A.P. is 3n^2 + 4n . Find the A.P.

In an A.P. if S_(n) = 5n^(2) -3n find the A.P. OR From the adjoining figure of a rectangle, find the values of x ond y.