**CSAT 2019 | DDSQ Jan 31 | Civil Services | IAS | UPSC | State PSC | SSC | IBPS | NDA | CDS | Railways**

While adding the first few continuous natural numbers, a candidate missed one of the numbers and wrote the answer as . What was the number missed? **(PYQ)**

What is the number of terms in the series , , , , , ? **(PYQ)**