Question

plz answer this quick!!!​

Answer 1

hope this answer will be helpful

Answer 2

Answer:

5040

Step-by-step explanation:

tₙ = a + (n - 1) * d

t₁₉ = a + 18 * d = 52

Similarly,

t₃₈ = a + 37 * d = 128

Therefore,

128 - 52 = a + 37 * d - (a + 18 * d)

--> 76 = 37d - 18d

--> 19d = 76

--> d = 4

--> a + 18d = 52

--> a = 52 - 72

--> a = -20

Sₙ = n/2 * (2a + [n - 1] * d)

--> S₅₆ = 28 * (-40 + 55 * 4)

= 28 * (-40 + 220)

= 28 * 180

Ans = 5040

Hope this helps! If it does, please feel free to mark it the brainliest! Thanks :D