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Asked by vikasg13.hardware | 28 Jun, 2018, 06:09: AM
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begin mathsize 16px style straight f left parenthesis 2 right parenthesis equals 2 straight f left parenthesis 2 cross times 1 right parenthesis equals 2 cross times 1...... which space satisfies space straight f left parenthesis mn right parenthesis equals straight f left parenthesis straight m right parenthesis space straight f left parenthesis straight n right parenthesis so space straight f left parenthesis 2 right parenthesis equals 2 comma space straight f left parenthesis 1 right parenthesis equals 1...... similarly space for space all space natural space numbers so sum space equals 1 plus 2 plus 3 plus...... plus 20 equals fraction numerator 20 cross times 21 over denominator 2 end fraction equals 210 end style
Answered by Arun | 14 Jul, 2018, 05:04: PM

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