Q20 of 25 Page 8

Find the 13th term in the expansion of


13th term in = T13 = T12 + 1
                                  = 18C12(9x)18 - 12
                                  = 18C12(9x)6

                                  = 18C12(9x)6
                                  = 18C12(9x)6
                                  = 18C12(32)6
                                  = 18C12(312)
                                  = 18C12 = 18564

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