

2 x 5 unit = 70
1 unit = 14
Thus, numbers are 14 & 70 only.
Every number except 50 contain 1 power of 5 and 50 contain 2 power so total power = 8+2 = 10
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a coin throws 5 times is equal to the 5 coins throws at one time. So total no of choices are 25=32 Chances that not getting at least one tails is 1 i.e., (h,h,h,h,h) So 1-(1/32)=31/32…option (b) is correct.
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( 5a2-3ab+7b2 )-( a2+ab+b2)= 4a2+4ab+6b2
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speed=distance/time S=75/2.5 S=30
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