Question

find the sum all two digit number which are divisible by 2 and 3

Answer 1

Answer:

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answer = 810

Step-by-step explanation:

a = 12

d =  6

an = 96

an = a + (n-1)d

96= 12+ (n-1) 6

96-12 =(n-1)6

84/6=n-1

14 +1 = n

15 = n

Sn =n/2 [a+an]

    = 15/2 * 12+96

     =15/2 *108

     = 15*54

     =810

  sum of all no. divisible by 2 and 3   = 810