RRB RPF RPSF SI and CONS Model Papers 2 with solutions

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Question : 21 of 120

Marks: +1, -0

√^3 { 1 - { 127 }/ { 343 } }

is equal to

$5/9$
$1-1/7$
$4/7$
$1-2/7$

Solution:

(b)

√^3 { 1 - { 127 }/ { 343 } }

= √^ 3 { { 343 - 127 }/ { 343 } }

= √ ^3 { { 216 }/ { 343 } } = √ ^3 { { ( 6 ) ^ { 3 } }/ { ( 7 ) ^ { 3 } } }

= { 6 } /{ 7 } = 1 - { 1 } /{ 7 }

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