Question

if s4=25 and s3=5 find a4​

Answer 1

Answer:

20

Step-by-step explanation:

s₄ = a₁ + a₂ + a₃ + a₄

s₃ = a₁ + a₂ + a₃

s₄ - s₃ = (a₁ + a₂ + a₃ + a₄) - (a₁ + a₂ + a₃ ) = a₄

a₄ = 25 - 5 = 20

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Answer 2

S[4]=A[1]+A[2]+A[3]+A[4]

S[3]=A[1]+A[2]+A[3]

S[4]-S[3]=A[1]+A[2]+A[3]+A[4]-A[1]+A[2]+A[3]=A[4]

A[4]=25-5=20

ANSWER=20

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