Who among the following found a formula for "infinite series for pi"?

Srinivasa Ramanujan

The correct answer is Option (3) → Srinivasa Ramanujan

The mathematician who found a formula for “infinite series for π” is Srinivasa Ramanujan.

• Ramanujan discovered remarkable formulas for π, many of which involve rapidly converging infinite series.
• These series are still used in modern computer calculations of π.