Question

[
begin{aligned}
t_{p} &=f-text { th teren }
&=3 p-1
end{aligned}
]
( therefore t_{1}=f ) iscot torm
[
begin{aligned}
=3 cdot 1-1 &: pm_{2}=operatorname{second} text { tarm }
=2 &=3 cdot 2-1
&=5
end{aligned}
]
( 0^{circ} cdot operatorname{trcot} operatorname{tar} m, a=2 )
( therefore ) isternon difference, ( d=t_{2}-t_{1} )
[
begin{array}{l}
=5-2
=3
end{array}
]
o. &um of firct n- terms, Son
[
begin{array}{l}
=frac{n}{2}[2 cdot 2+(n-1) cdot 3]
=frac{n}{2}[4+3 n-3]
=frac{(3 n+1) cdot n}{2}(A m)
end{array}
]

# zeca 3p-1. The sum of the 62. The pth term of an AP is – 6 . The sum of first n terms of the AP is (a) n(3n+1) (b) F (3n+1) (©) (3n-1) (d) None of these 63. The sum of all natural numbers from 100 to 300 which are divisible by 4 is

Solution