Question

English(En) A, B, C and D are non-zero numbers in ascending order such that each succeeding number is 1 more than its preceding number. If difference of and is equal to the difference of and , then
9(c+d_a-b)/abcd
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Answer 1

Answer:

This question is asked in ANTHE for class 8, isn't it ?

Answer 2

Answer:

this question answer is 64