Find the value of `(18^(3)+7^(3)+3xx18xx7xx25)/(3^(6)+6xx243xx2+15xx81xx4+20xx27xx8+15)`

Find the value of r if 5 xx 4P_r = 6 xx 5P_(r-1)

Find the sum 1-(1)/(8)+(1)/(8)xx(3)/(16)-(1xx3xx5)/(8xx16xx24)+….

Find the value of n, if 12 xx ^((n-1))P_3= 5 xx ^((n+1))P_3

Find the product 1) 7.45 xx 32 2) 6.3 xx 7.4 3) 16.4 xx 6.11 4) 7.382 xx 14 5) 72.346 xx 16.21 6) 126.35 xx 7.44

Find the sum to n terms of the series 3xx1^2+5xx2^2+7xx3^2+ ……..

12 times of (3)/(7)

(2/3)^3 xx(2/3)^5