Reciprocal of 4 is:
Question 86 (i)
Find the reciprocal of the following: (12×14)+(12×6)
Find the sum of the series s = 1 + 12(1 + 2) + 13(1 + 2 + 3) + 14(1 + 2 + 3 + 4) + .........upto 40 terms.