UPSC Government Jobs Exams Category

How many numbers can be formed with the digits 1,2,3,4,3,2,1 so that the odd digits always the odd places?

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UPSC Other Question

In how many ways can the letters of the word BALLOON be arranged so that two L’s do not come together? There are 3 different rings to be worn in four fingers with at most one in each finger. In how many ways can this be done?