Answer:

Explanation :

✦ Given :–

• S₁=2 (Sum of first one term)
• S₂=0 (Sum of first two terms)

✦ To Find :–

• S₁₀₀ (Sum of First 100 Terms)

✦ Formula Applied :–

• Sₙ=[2a+(n-1)d]

• aₙ=a+(n-1)d

✦ Solution :–

→ S₁=a

∴ a=2

→ S₂=a₁+a₂

∴ 0=2+a₂

⇒ a₂=(-2)

→ d=a₂-a₁=0-2=(-2)

∴ d=(-2)

Now we need to find S₁₀₀ :

∴ The Sum of first 100 terms is (-9700).