If sum of n terms of an AP is 2n2
– 3n. Find its nth term, common difference and 50th term
pls give ans with step by step explanation
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S1 = 2×1+3×1
S1=5
S2= 2×4+3×2
S2= 14
a1=S1 = 5
S2- S1 =a2
a2 =9
d= a2- a1
=9-5
d = 4
a n = a+(n-1)d
a n= 5× (n-1)4
a n =4n-1
a50 = a+49d
= 5+49× 4
= 105
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