`(1/2xx1/3)xx1/5 = 1/2 xx (1/3 xx ...)`

Perform the following multiplication a) 2/9 xx 7/8 xx 1/9 b) 1/3 xx 4/5 xx 1/4 c) 1/3 xx 2/4 xx 5/3 d) 1/2 xx 1/3 xx 1/4 e) 1/5 xx 2/5 xx 2/3 f) 2/3 xx 5/6 xx 1/4

Simplify: (1/2 xx 2/3)/(1/2 xx 2/3+3/8 xx 1/3)

2/3xx1/3-1/3xx5/2=

Evaluate (-1)/3 xx (1/2+1/4)xx((-1)/3 xx 1/2)+((-1)/3 xx 1/4)

Simplify (1-1/2)xx(1-1/3)xx(1-1/4)xx(1-1/5)=......... A) 1/2 B) 1/5 C) 4/5 D) 5

What is the sum of the following series ? 1/(1 xx 2) + 1/(2 xx 3) + 1/(3 xx 4) + ………+ 1/(100 xx 101)

Complete : ( 1/2 times 1/3 ) times 1/5 = 1/2 times ( 1/3 times .... )

If A= 1/(1xx2)+1/(1xx4)+1/(2xx3)+1/(4xx7)+ 1/(3xx4)+1/(7xx10) ...... upto 20 terms, then what is the value of A? यदि 1/(1xx2)+1/(1xx4)+1/(2xx3)+1/(4xx7)+ 1/(3xx4)+1/(7xx10).....20 पदों तक हो, तो A का मान क्या है?