Question

in an ap :given a 2 = 37, d=3, find a and S
12°​

Answer 1

Answer:

given a¹² = 37

d= 3

so n = 12

now

a¹³ = a + (12-1)(3)

a¹³ = a + 33

37 = a + 33

so a = 4

now sⁿ = n/2(a+aⁿ)

s¹² = 6(41)

=> 246.

hope it helps you

Answer 2

Step-by-step explanation:

If a2=37.

a2=a+d=37

a=37-3=34.

a12=a+11d=34+33=67.

Sn=n/2(a+an)

S12=12/2(34+67)

=606.