History of Hindu Mathematics: A Source Book v2.c17.s8.18

v2.c17.s8.18

“The sum of the series multiplied by eight times the common difference is added by the square of the difference between twice the first term and the common difference; the square-root (of the result) is diminished by twice the first term and (then) divided by the common difference: half of this quotient plus unity is the number of terms.”\1