Given,
9(x+1) = 25 + x
expanding,
9x + 1 = 25 + x
bringing x to left hand side and taking 1 to right hand side with change in their respective signs,
9x - x = 25-1
=> 8x = 24
transposing 8 ,
=> x = 24/8 = 3
Hence x = 3
Answer:
distance between the two points is 15
19 . Prob( 2 reds) = 1/2 * 25/51 = 25/102
20. This would be 15C12 = 15C3 = (15*14*13) / (3*2*1) = 455
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