Vah chhote se Chhota 7 ka gudaj kya hoga jisse 6,9, 15, 18 se bhag dene par pratyek dasha mein 4 se bacche
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6,9,15,18 ka lcm=90
90k+4/7=0,put tha value of k =1,2,3,4....
put k=4
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