`(1/(1xx4)+1/(4xx7)+1/(7xx10)+1/(10xx13)+1/(13xx16))=?`

The value of (1)/(1xx4)+(1)/(4xx7)+(1)/(7xx10)+…(1)/(16xx19) is

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?

((1)/(1.4 )+ (1)/(4.7 ) +(1)/(7.10 )+(1)/(10.13 )+(1)/(13.16)) is equal to

Two cards are drawn from a well shuffled deck of 52 playing cards with replacement. The probability that both cards are queen is 1/(13)xx1/(13) b. 1/(13)+1/(13) c. 1/(13)xx1/(17) d. 1/(13)xx4/5

frac(1)( 1 xx 4 )+ frac(1)(4 xx 7 ) + frac(1) (7 xx 10) + frac(1)(10 xx 13 ) + frac(1) (13 xx 16) = ?

If A= (1)/(1 xx 2) + (1)/(1 xx 4) + (1)/(2 xx 3) + (1)/(4 xx 7) + (1)/(3 xx 4) + (1)/(7 xx 10) …..upto 20 terms, then what is the value of A?

Verify each of the following: (i) ((5)/(7)xx (12)/(13))xx(7)/(18)= (5)/(7) xx ((12)/(13)xx(7)/(18)) (ii) (-13)/(24)xx((-12)/(5)xx(35)/(36))=((-13)/(24)xx(-12)/(5))xx (35)/(36) (iii) ((-9)/(5)xx (-10)/(3)) xx (21)/(-4) = (-9)/(5) xx ((-10)/(3) xx (21)/(-4))