UPSC Government Jobs Exams

How many 6's are there in 89873686398654868538 the following series which are not immediately followed by 3 but immediately preceded by 8?

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UPSC Other Question

If '+' means '*', '-' means '/', '*' means '-', '/' means '+' then 16-4+3*5/2= ?


Six persons is a meeting, shake hands with each other. How many handshakes were interchanged?