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PYQ 2017 - 3 digit numbers and its reverse with unique digits divisible by 7 | #csat #upsc #cse #ias
PYQ-2017) Certain 3-digit numbers have the following characteristics:
1. All the three digits are different.
2. The number is divisible by 7.
3. The number on reversing the digits is also divisible by 7.
How many such 3-digit numbers are there?
(a) 2
(b) 4
(c) 6
(d) 8
#csat #upsc #cse #ias #maths #shorts #trending
มุมมอง: 2 147

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How many 3 digits numbers are there which are divisible by 7? | #csat #upsc #cse #ias #maths
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Que) In a circular race of 1200m, A and B start from the same point and at the same time with speeds of 12.5 m/s and 7.5 m/s. Find when will they meet again for the first time on the trace when they are running in the same direction and Opposite direction? a. 240, 60 Secs b. 200, 60 secs c. 200, 80 Sec d. None of these 00:00 Question 00:58 Relative Motion concept 02:38 Solution #csat #upsc #cse...
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Que) Three persons P, Q, and R run along a circular track at speeds of 3 km/h, 4 km/h, 6 km/h, respectively. If the length of the track is 36 km, then after how much time will they meet again at the starting point? Ans. • Time taken by P to cover the track = 36 / 3 = 12 • Time taken by Q to cover the track = 36 / 4 = 9 • Time taken by R to cover the track = 36 / 6 = 6 • LCM of 12, 9 and 6 = 36 ...