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# Financial calculator question

I would like to do LN 25.21/25.20 on the calculator. It suppose to equal to 0.00397. i tired the division first then, 2nd and LN. could not arrive to the same result.
also, if you have a binomial model equation (P(X)= P(X=X)=(nCx) Px(1-P)n-x. Please note that Px is suppose to be to the power and n-x also to the power. How do you do 10C5 on the calculator?

I have the BAII Plus Texas Instrument.

Thank you,

• fmccray said:

I would like to do LN 25.21/25.20 on the calculator. It suppose to equal to 0.00397. i tired the division first then, 2nd and LN. could not arrive to the same result.

Do you mean LN (25.21/25.20)? I got 0.0004. Divide 25.21/25.2, then LN (no '2nd', at least on my BA II+)
• fmccray said:

How do you do 10C5 on the calculator?

10 > 2nd > nCr > 5 > = 252
• Thank you so much. This is going to save me a lot of time. i just noticed that nPr(Permutation) is right above it on the calculator.
• can a BA II PLUS calculator solve algebra such as the following?
80 = 100/(1 + r) ^10
thank you!