Question

the nth term of Ap is 2n+1 find sum three sums

Answer 1

heyyy !!
its me Nishant Mishra!!

your solution:

given: nth term is 2n+1
then,

first term =2(1)+1=>3

second term=2(2)+1=>5

here d=5-3=>2

now,

sum of first 3 terms => n/2{2a+(n-1)d}

=3/2{2×3+(2)2}

=3/2×10

=15

HOPE IT HELP!!!

Answer 2

Hey there!
n th term of an A. P = 2n+1 .
1st term = 2(1)+1 = 3
2nd term = 2(2)+1 = 5 .

Common difference = 5 - 3 = 2 .

Sum of n terms = n/2 [ 2a + (n-1)d ]

Sum of 3 terms = 3/2 [ 2(3)+ (2)(2) ]

= 3/2[ 6 + 4 ]
= 3/2 [ 10]
= 3 * 5
= 15

Hope helped!