PROBABILITY Binomial Theorem (Page 1 of 2)

The coefficients of a binomial expansion can be easily computed on the TI-83/84 using the nCr command located in the MATH PRB submenu. For example, let's find the coefficient of the fourth term in the expansion of (x+y)^7. The variable n is the exponent on the binomial, and the value of r is always one less than the term number. So, we must use n = 7 and r = 3. Enter the value of n first, then the command, followed by the value of r.

 2nd QUIT key. CLEAR key.

 7 MATH key. Left arrow key. 3: menu selection. 3 ENTER key.

 Calculator screen image.

The coefficient is 35.
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