If “Radha” occurs two times and “Reena” 3 then the array will be.

The syntax of using the COUNTIF function is: COUNTIF(range, criteria) Where: The range is required. The criterion is the condition that you want to test. sumproduct只是将这个数组 求和 。 其作用相当于数组公式（数组公式输入时要按ctrl+shift+enter完成） =SUM(1/COUNTIF(A2:A18,A2:A18)) hiromuyです。 あれ！？そうですか。う～ん？ 数式後半のIF文中で、 COUNTIF(A1:A10,0)=0が条件式ですが、これはA1:A10の範囲にあるブランクセル（数式は入力されている）の個数が0の場合ということ … Syntax of COUNTIF function. {2,2,3,3,3}.In this example it is {2;3;3;3;3;3;3;2;2;2}. The range specifies where to search in excel sheet (numbers, arrays, a named range or references that contain numbers can be given as range). If you select this part of formula and press F9, you will see the array. COUNTIF (A2:A11,A2:A11) : This part will return an array of the count of each element in the cell. 已知数列a1,a2,…,a30,其中a1,a2,…a10是首项为1公差为1的等差数列,a10,a11,…a20是公差为d 1年前 1个回答 excel前五项之和 即A1到A5=A6 A7到A12=A13 A14到A19=A20.以此类推得公式