RRB RPF RPSF SI and CONS Model Papers 6 with solutions

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Question : 39 of 120

Marks: +1, -0

Value of

{√{98}-7}/{√{2}}+ {√{147}-√{98}}/{√{6}}

+ {14-√{147}}/{2√{3}}+ {√{245}-14}/{2 √{5}}

+ - - - - +

{√{2401}-√{2352}}/{√{2352}}=?

8
6
1
$6/ 7$

Solution:

(2)

7

( { {√{2}-1}/{√{2}}+ {√{3}-√{2}}/{√{6}}+ {2- {3}}/{2 √{3}}} {+ {√{5}-2}/{2 √{5}}+....+ {√{49}-√{48}}/{√{2352}}})

=7(1-1/√2+1/√2-1/√3+1/√3-1/2+1/2-1/√5+....+1/√48-1/√49)

=7 (1- {1}/{√{49}} )=7 ×{6}/{7}=6

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