Recently, Nepal Central Bank released how many coins to mark Guru Nanak Dev's birth anniversary?

The Central Bank of Nepal released three coins to commemorate the birth anniversary of Sikh Guru Nanak Dev. The coins with denomination of NPR (Nepali Rupees) 100, 1000 and 2500 were jointly launched by Governor of Nepal Rastra Bank (NRB) Chiranjibi Nepal and Indian Ambassador to Nepal Manjeev Singh Puri at Hotel Aloft in Kathmandu. The coins possess monetary value and its sale will start from September 30, the NRB said. "Proud to be a Sikh today".