A seven digit number is of the form abcdefg such that a<b<c<d and d>e>f>g . The number of such numbers is:a)1980 b)1116 c)1476 d)1560

Hello student,
Please find my response to your question below
Your question is not clear that is whether the repetiotion is allowed or not allowed in digits.So iam unable to interpret your query.
Please recheck the question and post it again so that i can provide you with a meaningful answer.