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Alternate Method: All pencils are books (A) + All books are erasers (A) ⇒ All pencils are erasers (A) ⇒ Conversion ⇒ Some erasers are pencils (I). Hence conclusion I follows but conclusion II does not follow.
How many 6-digit numbers can be formed from the digits 0,3,4,5,6 and 8, in which the digits are not repeated?
In a Group of 8 boys and 6 girls, Six children are to be selected. In how many different ways can they be selected such that at least one boy should be ...
What will be the number of permutations of n different things, taken r at a time, where repeatition is allowed?
Find the quantity of arrangements of the letters of the word INDEPENDENCE if all the vowels always occur together?
Find the number of words that can be formed by using all letters of the word 'ESCAPE', if it starts with letter C and end with letter P.
Find the number of words that can be formed by using all letters of the word 'PAINT', if order of vowels remains same.
In how many ways can the letters of the word PARALLEL be arranged so that all the L's do not come together?
In how many different ways can 4 blue beads and 3 red beads be arranged in a row such that all the blue beads are together and all the red beads are tog...
A person has 12 friends out of which 7 are relatives. In how many ways can he invite 6 friends such that at least 4 of them are relatives?
How many words can be formed with the letter of the word ‘NUMBER’ when alll vowels are never together?