If sqrt(10-2 sqrt 21)+ sqrt(8+2 sqrt 15)...

If `sqrt(10-2 sqrt 21)+ sqrt(8+2 sqrt 15)=sqrt a+ sqrt b`, where a and b are positive integers, then the value of `sqrt(ab)` is closest to:

5.9

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7.2

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If sqrt(10-2 sqrt21)+ sqrt(8+2 sqrt15)= sqrta+ sqrt b , where a and b are positive integers, then the value of sqrt(ab) is closest to : यदि sqrt(10-2 sqrt21)+ sqrt(8+2 sqrt15)= sqrta+ sqrt b है, जहाँ a और b धनात्मक पूर्णाक है, तो sqrt(ab) का मान ( लगभग ) ज्ञात करें |

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