Question

answer it fast as possible plz

Answer 1

Answer: First term = 10, 20th term = 200

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Step-by-step explanation:

SN = N/2(2A+(N-1)D)

S14 = 7(2A +13D)=1050

-> 2A + 13D = 150(I)

Also, S28 - S14 = 3010

14(2A+27D) - 7(2A + 13D) = 3010

7[4A + 54D - 2A - 13D] = 3010

2A + 41D = 430(II)

Solving I,II-

D = 10

A=10

-> A1 = 10

-> A20 = A1 + 19D = 200

FIRST TERM=10, 20TH TERM=200