without adding find. the value of 1+3+5+7+9
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121 = 1+3+5+7+9+11+13+15+17+19+21. Thus , 121 is a perfact square. Since, 55 cannot be expressed as the sum of successive old numbers starting from 1.
∴ 55 is not a perfact square.
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=25 hope it help you follow me plzz
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