If 1+2+3+4+5+6+7+8+9+10 = 100, then atleast in how many places you need to change '+' with '×' to make equality hold good?
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1+2+3+4+5+6+7+8+9+10=55
1+2+3+4+5+6+7+8+9+10+1+2+3+4+5+6+7+8+9=100
55+45=100
100=100
hence proved
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