Question

13
given a,, = 37, d=3, find a and S
12​

Answer 1

Answer:

a=4. ,S¹²=246

Explanation:

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.