Question

if 9p5 +5*9p4=10pr ,prove that 5=10-r​

Answer 1

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9p5+ 5× 9p4 = 10pr

91/4 + 5 x 9/ 5 = 10/ (10-r)

cancelling the 9 on LHS and 10 on RHS

1/4 + 5/5 = 10/(10-r)

taking LCM

5+5/5= 10 / (10-r)

5! = (10-r)

➭ 5 = 10-r hence proved!

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Answer 2

Answer:

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9p5+ 5× 9p4 = 10pr

91/4 + 5 x 9/ 5 = 10/ (10-r)

cancelling the 9 on LHS and 10 on RHS

1/4 + 5/5 = 10/(10-r)

taking LCM

5+5/5= 10 / (10-r)

5! = (10-r)

➭ 5 = 10-r hence proved

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