2 14 84 420 1680 5040 ?

3 20 78 332 1680 ?

Find the missing (?) in the series 14, 28, 42, 56, ? , 84 , 98 A. 68 B. 70 C. 72 D. 74

In how many different ways can the letters of the word RIDDLED be arranged? (a) 840 (b) 1680 (c) 2520 (d) 5040 (e) None of these

Which term of the A.P. 21 ,\ 42 ,\ 63 ,\ 84 ,\ dot is 420?

Which term of the arithmetic progression 21, 42, 63, 84, … is 420 ?

Evaluate: 14.7 + 0.84 div 0.3 - 2.4 xx 1.2 + 15.8

In how many different ways can the letters of the word OFFICES be arranged? (a) 2520 (b) 5040, (c) 1850 (d) 1680 (e) None of these

Find the wrong number in the following series. 40320, 5040, 720, 120, 30, 6, 2