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400 by repeated subtraction |
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Answer» Step-by-step explanation: 400-1=399 399-3=396 396-5=391 391-7=384 384-9=375 375-11=364 364-13=351 351-15=336 336-17=319 319-19=300 300-21=279 279-23=256 256-25=231 231-27=204 204-29=175 175-31=144 144-33=111 111-35=76 76-37=39 39-39=0 thus no. of STEPS =20 so √400=20 |
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